Mid ocean ridge definition Quizlet

Mid Oceanic Ridge Quizlet is the easiest way to study, practice and master what you're learning. Create your own flashcards or choose from millions created by other students. More than 50 million students study for free with the Quizlet app each month Mid-Ocean Ridges (Definition) The center of the mid-ocean ridge is causing the ocean floor to do this. Magma. Is oozing out the center of the mid-ocean ridge. A Crack in Earth's Surface. Quizlet Live. Quizlet Learn. Diagrams. Flashcards. Mobile. Help. Sign up. Help Center. Honor Code Mid Oceanic Ridges Quizlet is the easiest way to study, practice and master what you're learning. Create your own flashcards or choose from millions created by other students. More than 50 million students study for free with the Quizlet app each month Start studying Mid-Ocean Ridges, Sea Floor Spreading and Deep Ocean Trenches. Learn vocabulary, terms, and more with flashcards, games, and other study tools

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  1. What's the difference between a mid ocean ridge and a trench? If there are more subduction zones than mid-ocean ridges, what happens to the ocean? Which of the following features of the ocean is a long underwater mountain chain where new ocean floor forms? Nice work
  2. Definition: WHen the denser ocean crust gets pulled underneath the lighter crust and thickens. Divergent Boundary Definition: When two plates are being pulled apart from eather over a long period of time
  3. describe 4 earth systems and list the characteristics of each (Pages 8-9) geosphere is the surface of the earth down to the core the atmosphere is the blanket of gases that cover the planet the hydrosphere is all the water on earth including in the atmosphere biosphere is where all organism live. list one way that earths systems could interact.
  4. Definition of mid-ocean ridge : an elevated region with a central valley on an ocean floor at the boundary between two diverging tectonic plates where new crust forms from upwelling magma Examples of mid-ocean ridge in a Sentenc
  5. Mid-ocean ridge cross-section (cut-away view) A mid-ocean ridge (MOR) is a seafloor mountain system formed by plate tectonics. It typically has a depth of ~ 2,600 meters (8,500 ft) and rises about two kilometers above the deepest portion of an ocean basin. This feature is where seafloor spreading takes place along a divergent plate boundary
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The mid-ocean ridge is the most extensive chain of mountains on Earth, stretching nearly 65,000 kilometers (40,390 miles) and with more than 90 percent of the mountain range lying in the deep ocean. The nearly continuous, global mid-ocean ridge system snakes across the Earth's surface like the seams on a baseball The Mid-Atlantic Ridge is a mid-ocean ridge (a divergent or constructive plate boundary) located along the floor of the Atlantic Ocean, and part of the longest mountain range in the world The Atlantic Ocean is currently getting bigger. There are not many trenches in the Atlantic to swallow up old rock and recycle it. The mid-ocean ridge is making new rock quicker than it can be recycled noun a north-south suboceanic ridge in the Atlantic Ocean from Iceland to Antarctica on whose crest are several groups of islands; shown by plate tectonics to be the axis along which North America has split away from Eurasia, and along which South America has split away from Africa Osteoblasts. Earthquakes occur all the time all over the world, both along plate edges and along faults. 5. Cross-section of the Earth's structure. Compression Fracture. When they occur on land, they produce faults. The San Andreas fault is a well-known, strike-slip (transform) fault (Fig. Bleeding. This type of fracture is more common in older children. A mid-ocean ridge or mid-oceanic ridge.

The center slit stands for the passage where the molten material can enter the Mid-Ocean Ridge, formed by the converging of plates. The side slits stand for where subduction has occurred and the ocean floor has sunk in. Also, the space under the paper stands for the oceanic crust of the Earth Physical weathering can be caused when rocks formed under pressure deep within the Earth become exposed at the surface. When overlaying material is removed above the rocks, the pressure decreases. The rock expands causing the outermost layers of rock to separate from the underlying rock Definition. expression produced by a plate descending underneath another one. Term. divergent boundary. Definition. plates moving apart from one another. occur along the crest of oceanic ridges. also called spreading centers because seafloor spreading occurs at these boundaries. Term The primary role of the mid-ocean ridge in the movement of plates is the fact that it indicates that two plates are actually moving, either pulling or pushing each other. The mid-ocean ridge can also be considered to be an underwater mountain range as two tectonic processes, ridge-push and slab-pull, occur

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Most divergent boundaries are located along mid-ocean oceanic ridges (although some are on land). The mid-ocean ridge system is a giant undersea mountain range, and is the largest geological feature on Earth; at 65,000 km long and about 1000 km wide, it covers 23% of Earth's surface (Figure 4.5. 1) Gcs Earth Science Unit B Test. 3 Divergent Plate Boundaries. Mid Ocean Ridge Diagram Room Gif 792 338 Mid Ocean Ridge. Solved In Class Lab Exercises The Diagram Below Is A Simp. Model Of Sea Floor Spreading. Convergent Boundary Wikipedia. Divergent Boundaries

Mid Oceanic Ridges: study guides and answers on Quizle

: the divergence at mid-ocean ridges of the tectonic plates underlying the oceans that is due to upwelling from the earth's interior of magma which solidifies and adds to the spreading plates. What is sea floor spreading Mid-ocean ridges. The global mid-ocean ridge system is the largest single volcanic feature on the Earth, encircling it like the seams of a baseball. Here the Earth's crust is spreading, creating new ocean floor and literally renewing the surface of our planet. Older crust is recycled back into the mantle elsewhere on the globe, typically.

Mid-Ocean Ridges, Sea Floor Spreading and Deep - Quizle

Definition. [image] Radar altimeters on satellites have collected data on sea surface elevation that help produce maps of the sea floor. [image] The ocean's great depth and opaque character have hindered mapping efforts. [image] Only a small percentage of the ocean floor has been mapped as accurately as the Moon Oceanic area = 303x10^6km^2 (59.4%) 11.5% of Earth is continent below sea level. Term. Name the major oceans and their main characteristics. Definition. Pacific Ocean- Largest, deepest, lots of islands and seamounts. Atlantic Ocean- long, narrow, parrallel sides 68% of freshwater runs into it d) a zone of active volcanoes. Term. Magnetic patterns on the ocean floor were puzzling. because they? Definition. a) indicated that all the rocks had reversed polarity. b) contradicted the idea of sea-floor spreading. c) showed alternating bands of normal and reversed polarity. d) were not symmetrical pushes the older crust away from the mid-ocean ridge. The mid-ocean ridge, at the center of this formation, is shown below. The closer the crust is to a mid-ocean ridge, the younger the oceanic crust is. Scientists concluded that as the seafloor spreads, the continents must be moving. Seafloor spreading is the mechanism that explains Wegener'

What's the difference between a mid ocean ridge and a

The Mid-Atlantic ridge is an ocean ridge found along the Atlantic Ocean floor. The ridge, he thought, was where new seafloor was being added to the earth's lithosphere , which in turn pushed the. The mid-ocean ridge, the Earth's longest mountain range, is a 65,000 kilometers (40,390 miles) long and 1,500 kilometers (932 miles) wide divergent boundary. In Iceland, one of the most geologically active locations on Earth, the divergence of the North American and Eurasian plates along the Mid-Atlantic Ridge can be observed as the ridge. The Basics of Ridge-Push. The Earth's longest continuous mountain chain is one of the most difficult-to-see and remote features on Earth. Connected systems of mid-ocean ridges wind along the. The simple result is that the ridge height or ocean depth is proportional to the square root of its age. Oceanic lithosphere is continuously formed at a constant rate at the mid-ocean ridges. The source of the lithosphere has a half-plane shape (x = 0, z < 0) and a constant temperature T 1

The mid-ocean ridge is the longest mountain range on Earth. The mid-ocean ridge is visible in this satellite captured, bathymetric data of the western Atlantic Ocean Basin. The mid-ocean range stretches around the globe like the seam of a baseball. The longest mountain range on Earth is called the mid-ocean ridge The mid-oceanic ridges rise 3000 meters from the ocean floor and are more than 2000 kilometers wide surpassing the Himalayas in size. The mapping of the seafloor also revealed that these huge underwater mountain ranges have a deep trench which bisects the length of the ridges and in places is more than 2000 meters deep

The magnetism of mid-ocean ridges helped scientists first identify the process of seafloor spreading in the early 20th century. Basalt, the once-molten rock that makes up most new oceanic crust, is a fairly magnetic substance, and scientists began using magnetometers to measure the magnetism of the ocean floor in the 1950s.What they discovered was that the magnetism of the ocean floor around. Mid-Ocean Ridges. Mid-ocean ridges are divergent boundaries where convection currents in the mantle lift the ocean floor and produce a rift in the lithosphere that follows the crest of the ridge. New lithosphere is created by volcanic activity along the crest of the ridge, and the plates on either side of the ridge are moving away from one another Seafloor Bathymetry. World War II gave scientists the tools to find the mechanism for continental drift that had eluded Wegener. Maps and other data gathered during the war allowed scientists to develop the seafloor spreading hypothesis.This hypothesis traces oceanic crust from its origin at a mid-ocean ridge to its destruction at a deep sea trench and is the mechanism for continental drift.

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New oceanic crust is forming continuously at the crest of the mid-ocean ridge and cools to become solid crust. The oceanic crust becomes increasingly older at increasing distance from the ridge crest with seafloor spreading. The result will be a zebra-like striping of the magnetic polarity in the rock that parallels the mid-ocean ridge Free Tool to get all the question people are searching online. Add a keyword plus the country targeted and our tool will give you all the question searched by people online Bathymetry of the ocean floor showing the continental shelves (red) and the mid-ocean ridges (yellow-green) Bathymetry (pronounced / bəˈθɪmətriː /) is the study of underwater depth of ocean floors or lake floors. In other words, bathymetry is the underwater equivalent to hypsometry or topography. The name comes from Greek βαθύς. Theory of Plate tectonics Definition and Evidence | UPSC - IAS. Tectonic plates are massive, rigid pieces of the Earth's crust; they form the majority of the geological foundation of the surface features of the earth.These plates slowly travel across the Earth, moving entire sections of continental and oceanic crust along with them. Despite the questions about the validity of continental.

Mid-ocean ridges are part of chain of mountains some 84,000 km long. The Mid-Atlantic Ridge is the longest mountain chain on Earth. These ridges are spreading centers or divergent plate boundaries where the upwelling of magma from the mantle creates new ocean floor. Deep-sea trenches are long, narrow basins which extend 8-11 km below sea level. Beside above, what is the first step of seafloor spreading quizlet? Sea-Floor Spreading begins at a mid-ocean ridge, which forms along a crack in the oceanic crust. along the ridge, molten material that forms several kilometers beneath the surface rises and erupts. at the same time, older rock moves outward on both sides of the ridge The mid-ocean ridges actually are one long ridge that continues through every ocean in the world, and at a total of 49,700 miles, it's the longest mountain range on Earth. Subduction and Volcanoe Which of the following increases with distance from a mid-ocean ridge? the age of oceanic lithosphere the depth to the sea floor the thickness of the lithosphere all of the above. The cross section above depicts magnetized oceanic crust at a spreading center. The + symbol indicates normal magnetic bands and the - symbol indicates reversed. Scientists brought these observations together in the early 1960s to create the seafloor spreading hypothesis. In this hypothesis, hot buoyant mantle rises up a mid-ocean ridge, causing the ridge to rise upward ( Figure below ). Magma at the mid-ocean ridge creates new seafloor. The hot magma at the ridge erupts as lava that forms new seafloor

A mid-ocean ridge (MOR) is a seafloor mountain system formed by plate tectonics.It typically has a depth of ~ 2,600 meters (8,500 ft) and rises about two kilometers above the deepest portion of an ocean basin.This feature is where seafloor spreading takes place along a divergent plate boundary.The rate of seafloor spreading determines the. A mantle plume is a proposed mechanism of convection within the Earth's mantle.Because the plume head partially melts on reaching shallow depths, a plume is often invoked as the cause of volcanic hotspots, such as Hawaii or Iceland, and large igneous provinces such as the Deccan and Siberian traps.Some such volcanic regions lie far from tectonic plate boundaries, while others represent.

This is the same process that gives rise to higher seafloor topography at oceanic ridges, such as the Mid-Atlantic Ridge in the Atlantic Ocean, and deeper ocean at abyssal plains and oceanic trenches, such as the Mariana Trench. Thus, the island or shoal that will eventually become a guyot slowly subsides over millions of years. In the right. The mid-ocean ridge is formed where tectonic plates are moving apart from each other, allowing magma to seep out in the space where the plates pulled apart. The mid-ocean ridge system is 80,000 kilometers in total length and mostly underwater except for a few places like Iceland Subduction is the driving force behind plate tectonics, and without it, plate tectonics could not occur. Oceanic subduction zones are located along 55,000 km (34,000 mi) of convergent plate margins, almost equal to the cumulative 60,000 km (37,000 mi) of mid-ocean ridges

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mid-ocean ridges lie hidden under hundreds of meters of water. A steep-sided valley splits the top of some mid-ocean ridges. The Earth's ocean floors move like conveyor belts, carrying the continents along with them, as they move. This movement begins at a mid-ocean ridge. A ridge forms along a crack in the oceanic crust. At a mid-ocean ridge. Earthquake, any sudden shaking of the ground caused by the passage of seismic waves through Earth's rocks. Earthquakes occur most often along geologic faults, narrow zones where rock masses move in relation to one another. Learn more about the causes and effects of earthquakes in this article Transform fault, in geology and oceanography, a type of fault in which two tectonic plates slide past one another. A transform fault may occur in the portion of a fracture zone that exists between different offset spreading centres or that connects spreading centres to deep-sea trenches i Matthew Rioux, a researcher at MIT, analyzed pieces of ocean crust from the East Pacific Rise, a mid-ocean ridge 1,200 miles (1,900 kilometers) off the west coast of South America that is one of.

The best-known mid-ocean ridge is the 6,200-mile Mid-Atlantic Ridge, which runs from the Arctic Ocean to a point just south of South Africa. Most of its peaks are submerged, but some are tall enough to rise above the ocean's surface, forming islands such as Iceland. The Mid-Atlantic Ridge is one part of a nearly 50,000-mile ridge system that. MGT 498 Final. 7 terms. gallsari. glg 121 exam 3. 6 terms. gallsari. Upgrade to remove ads. Only $3.99/month

What is seafood spreading? Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. What is the best definition of seafloor spreading? : the divergence at mid-ocean ridges of the tectonic plates underlying the oceans that is due [ The mid-ocean ridge system is the most extensive chain of mountains on earth, but more than 90% of this mountain range lies in the deep ocean. The mid-ocean ridge wraps around the globe for more than 65,000 km like the seam of a baseball. The average depth to the crest (top) of the ridge is 2500 m, but it rises above sea-level in Iceland and is. The mid-ocean ridge is a continuous range of undersea volcanic mountains that encircles the globe almost entirely underwater. It is a central feature of seafloor terrain that is more varied and more spectacular than almost anything found on dry land, and includes a collection of volcanic ridges, rifts, fault zones, and other geologic features Mid-ocean ridges are geologically important because they occur along the kind of plate boundary where new ocean floor is created as the plates spread apart. Thus the mid-ocean ridge is also known as a 'spreading center' or a 'divergent plate boundary.' The plates spread apart at rates of 1 cm to 20 cm per year

Mid-Ocean Ridges: Magnetics & Polarity How Fast is the Mid-Ocean Ridge Spreading? When lava gets erupted at the mid-ocean ridge axis it cools and turns into hard rock. As it cools it becomes permanently magnetized in the direction of the Earth's magnetic field. Magnetometers, towed near the sea surface behin The most notable mid-ocean ridge is the Mid-Atlantic ridge running down the middle of the Atlantic Ocean as seen on a bathymetry map. Mid-ocean ridges are plate boundaries that are on the ocean floor and are spreading plate boundaries where new cr.. Mid ocean ridges extend to 40,000 miles that encircles the earth. Mid ocean ridge is the third biggest ocean phenomenon after continent and ocean basins. Since it consists of volcano series, it has distinct and diverse geological features. Here are 20 geological characteristics of mid ocean ridges The mid-ocean ridge is the region where new oceanic crust is created. The oceanic crust is composed of rocks that move away from the ridge as new crust is being formed. The formation of the new crust is due to the rising of the molten material (magma) from the mantle by convection current. When the molten magma reaches the oceanic crust, it. Mid Ocean Ridges And Rift Valleys Plate Tectonics For 5th Mid Oceanic Ridge Mid Atlantic Ridge Flashcards Quizlet The Many Features Of Our Oceans Your Connection To Wildlife Seeing The Seafloor In High Definition Modern Mappin

Mid-ocean Ridge Definition of Mid-ocean Ridge by Merriam

  1. 1. Along which features does seafloor spreading occur? A. fault lines B. mid-ocean ridges C. ocean basins D. ocean trenches 2. Which statement identifies a major reason for the subduction that helps to form volcanoes? A. the release of hot ash and steam in a pyroclastic flow B. the unusually high temperature at hotspots C. the upwelling of magma between diverging plates D. the difference in.
  2. Mid-ocean ridges and diverging plates A mid-ocean ridge is a plate margin where two tectonic plates are diverging. Molten rocks emerge from beneath the crest of the ridge. Geologists estimate that 75 percent of the molten rocks or magma reaching Earth's surface does so through mid-ocean ridges
  3. As the ocean seafloor spreads, the newly formed floor will adapt a specific magnetic signature according to the Earth's magnetic pole at that time. As years pass, lateral segments of seafloor will thus share the same _____ signature on either side of the mid-oceanic ridge
  4. Fast-Spreading Mid-Ocean Ridge. Faster spreading ridges like the northern and southern East Pacific Rise are hotter, meaning more magma is present beneath the ridge axis and more volcanic eruptions occur. Because the plate under the ridge crest is hotter scientists think that the plate responds to the divergent spreading process more fluidly

Mid-ocean ridge - Wikipedi

While mid-ocean ridges are a submarine features, in some places, the Mid-ocean ridges in the world are all connected and make the Ocean Ridge, which with a total length of 40,400 miles is the longest mountain range in the world. Mid-ocean ridges have ongoing geological activity, with scientists believing that they move several inches each year In many locations, this mid-ocean ridge was found to contain a gigantic cleft, or rift, 20 to 30 mi (32-48 km) wide and c.1 mi (1.6 km) deep, extending along the crest of the ridge. The ridge itself does not form a smooth path, but is instead offset in many places. The offsets are called fracture zones, or transform faults

Mid-Ocean Ridge - YouTub

oceanic ridge, continuous submarine mountain chain extending approximately 80,000 km (50,000 miles) through all the world's oceans.Individually, ocean ridges are the largest features in ocean basins.Collectively, the oceanic ridge system is the most prominent feature on Earth's surface after the continents and the ocean basins themselves. In the past these features were referred to as mid. The vast majority of mid-ocean ridges are located deep below the sea. Here is an animation from the United States Geologic Survey (USGS) of divergent plate boundary at mid-ocean ridge and another animation by IRIS.As divergence occurs, shallow earthquakes can occur along with volcanoes along the rift areas Magnetic reversal definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Look it up now The mid-ocean spreading ridge covers the largest fraction of abyssal zone in the Arctic Ocean, where it characterizes 4.76% of the area of abyssal zone, and it is absent from the Mediterranean and Black Sea. The greatest area of mid-ocean ridges occurs in the South Pacific Ocean where this feature type covers an area of 1,868,490 km 2

What is the mid-ocean ridge?: Ocean Exploration Facts

The Mid-Atlantic Ridge is a submarine ridge located along the floor of the Atlantic Ocean, that wraps around the globe for more than 65,000 km like the seam of a baseball. It is the longest and the most extensive chain of mountains on earth, but being located underwater, more than 90% of this mountain range remains hidden from view The tectonic process that takes place along mid-ocean ridges is called seafloor spreading. The mid-ocean ridge is formed when magma rises up to the surface at a divergent boundary Seafloor spreading, theory that oceanic crust forms along submarine mountain zones, known collectively as the mid-ocean ridge system, and spreads out laterally away from them. This idea played a pivotal role in the development of the theory of plate tectonics, which revolutionized geologic thought during the last quarter of the 20th century.. Shortly after the conclusion of World War II, sonar. So the entire ridge system is made up of igneous rock that is either extrusive or intrusive. Earthquakes are common at mid-ocean ridges since the movement of magma and oceanic crust results in crustal shaking. The vast majority of mid-ocean ridges are located deep below the sea (figure 4) presence of water and carbon dioxide some of features found here include the ocean floor mid oceanic ridges ocean trenches and numerous, learn vocabulary test science earth dynamic ocean floor with free interactive flashcards choose from 500 different sets of vocabulary test science earth dynamic ocean floor flashcards on quizlet, earth scienc

Mid-Atlantic Ridge - Wikipedi

  1. Map of the Mid-Ocean Ridges. Andrew Alden is a geologist based in Oakland, California. He works as a research guide for the U.S. Geological Survey. Almost entirely hidden under the sea is a worldwide chain of low mountains with lines of volcanic activity running along their crests. Their worldwide extent was recognized in the mid-20th century.
  2. At mid-ocean ridges, the elevation is higher than the surrounding ocean floor. As the convection currents within the Earth cause new lithospheric material to rise and spread away from the ridge, gravity causes the older material to sink toward the ocean floor and aid in the movement of the plates
  3. Plate tectonics, theory dealing with the dynamics of Earth's outer shell that revolutionized Earth sciences by providing a uniform context for understanding mountain-building processes, volcanoes, and earthquakes as well as the evolution of Earth's surface and reconstructing its past continents and oceans

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Mid-ocean ridge. Rising up from the abyssal plain, you would encounter the mid-ocean ridge, an underwater mountain range, over 40,000 miles long, rising to an average depth of 8,000 feet. Tracing their way around the global ocean, this system of underwater volcanoes forms the longest mountain range on Earth. Ocean trenche Rising an average of about 4,500 meters(m) above the sea floor, the mid-ocean ridge overshadows all the mountains in the United States except for Mount McKinley (Denali) in Alaska (6,194 m) Though hidden beneath the ocean surface, the global mid-ocean ridge system is the most prominent topographic feature on the surface of our planet The magnetic history of the earth is thus recorded in the spreading ocean floors as in a very slow magnetic tape recording, forming a continuous record of the movement of the ocean floors. Other supportive evidence has emerged from study of the fracture zones that offset the sections of the ridge. Introduction. Discovery of the Mid-Ocean Ridges

Mid-atlantic ridge Definition of Mid-atlantic ridge at

  1. This ridge is a 40.000 km crack in the ocean floor caused by the separation of the North American and Eurasian tectonic plates. The Mid-Atlantic Ridge has made Iceland into a landmass between the submarine Reykjanes Ridge to the southwest and the Kolbeinsey Ridge to the north, and has been active during the last 20-25 million years, broadly.
  2. ocean trenches and ridges. Trench: very deep, elongated cavity bordering a continent or an island arc; it forms when one tectonic plate slides beneath another. Ridge: underwater mountain range that criss-crosses the oceans and is formed by rising magma in a zone where two plates are moving apart. previous. next
  3. Divergent plate tectonics pull apart from each other producing rift valleys at mid-oceanic ridges. Most divergent plates are at oceanic plate boundaries. This is where long chains of underwater volcanoes spew out lava. And it turns out, these mid-oceanic ridges (rift valleys) has the youngest geologic rocks on the planet

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  1. g at the ridge crest picks up the existing magnetic polarity. Divergence then moves the swath of fresh crust away from the ridge. As long as the magnetic field remains constant, the polarity stripe widens
  2. Life Cycle of the Oceanic Crust. All rocks in Earth's crust are constantly being recycled through the rock cycle. The rock cycle is the transition of rocks among three different rock types over millions of years of geologic time (Fig. 7.56).Igneous rock is formed by the cooling and crystallization of molten magma at volcanoes and mid-ocean ridges, where new crust is generated
  3. The oceanic crust is consequently basaltic and relatively uniform in composition with a standard layered structure that is independent of the ridge spreading rate. Oceanic basalts formed at ridges are termed Mid-Ocean Ridge Basalts as distinct from basalts added on top of older oceanic crust by volcanism in volcanoes on ocean islands, which are.
  4. Plate Tectonics Flashcards Quizlet. Quizlet.com DA: 11 PA: 39 MOZ Rank: 52. A theory of how the pieces of the Earth's surface (the plates) move; An undersea mountain range formed by plate tectonics; A hypothesis that new seafloor is created at mid-ocean ridges, and in the process, the
  5. Subduction Zone, Subduction zones occur at collision boundaries where at least one of the colliding lithospheric plates contains oceanic crust . In accord with plate Crust, Crust Earth's mass is divided into an inner core, outer core, mantle, and crust. The crust is outermost layer of the earth, 3-44 miles (5-70 km) thic Ocean, Oceans are large bodies of salt water that surround.
  6. g majority of all water on the planet and have an average depth of almost 4 km (about 2.5 miles). A number of major features of the basins depart from this average—for example, the mountainous ocean ridges, deep-sea trenches, and jagged.

What a deep canyon in the ocean floor is called

Midpoint definition, a point at or near the middle of, or equidistant from, both ends, as of a line: the midpoint of a boundary. See more 2.4.2. Mid-ocean ridges. Progression from rift to mid-ocean ridge. As rifting and volcanic activity progress, the continental lithosphere becomes more mafic (see Chapter 4) and thinner, with the eventual result transforming the plate under the rifting area into oceanic lithosphere. This is the process that gives birth to a new ocean, much like.

abyssal plain. Zone located at a depth of 6,600 to 20,000 feet; it covers most of the ocean floor. English French Visual Dictionary. Free Online Dictionary Plate Tectonics and the Hawaiian Hot Spot. In the early 1960s, the related concepts of seafloor spreading and plate tectonics emerged as powerful new hypotheses that geologists used to interpret the features and movements of the Earth's surface layer.According to the plate tectonic theory, the Earth's rigid outer layer, or lithosphere, consists of about a dozen slabs or plates, each. Young oceanic lithosphere is hot and buoyant (low density) when it forms at a midocean ridge. But as it spreads away from the ridge and cools and contracts (becomse denser) it is able to sink into the hotter underlying mantle. There is a deep ocean trench where the oceanic plate bends downward Sea-Floor Spreading Answer Key. This is a mid-ocean ridge. It is an underwater mountain range that forms when magma pushes up on the crust at a divergent boundary. Seafloor spreading is happening at B. Molten rock pushes up from the asthenosphere and pushes the plates apart at the mid-ocean ridge. This creates new ocean crust