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________ Is When Cold Oceanic Lithosphere Are More Dense Than The Underlying Warm Lithosphere.

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________ Is When Cold Oceanic Lithosphere Are More Dense Than The Underlying Warm Lithosphere.?

Subduction is possible because the cold oceanic lithosphere is slightly denser than the underlying asthenosphere the hot ductile layer in the upper mantle underlying the cold rigid lithosphere. Once initiated stable subduction is driven mostly by the negative buoyancy of the dense subducting lithosphere.Subduction is possible because the cold oceanic lithosphere is slightly denser than the underlying asthenosphere

asthenosphere
It lies below the lithosphere between approximately 80 and 200 km (50 and 120 miles) below the surface. The lithosphere–asthenosphere boundary is usually referred to as the LAB. The asthenosphere is almost solid although some of its regions are molten (e.g. below mid-ocean ridges).

Why does oceanic lithosphere Subduct even when the oceanic crust is less dense than the underlying asthenosphere quizlet?

Explain why oceanic lithosphere subducts even though the oceanic crust is less dense than the underlying asthenosphere. Oceanic lithosphere subducts because its overall density is greater than that of the underlying mantle.

Which type of tectonic boundary is the result of two tectonic plates sliding past each other?

transform plate boundary

A transform plate boundary occurs when two plates slide past each other horizontally. A well-known transform plate boundary is the San Andreas Fault which is responsible for many of California’s earthquakes.

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What is the theory of continental drift?

Continental drift describes one of the earliest ways geologists thought continents moved over time. … In the early 20th century Wegener published a paper explaining his theory that the continental landmasses were “drifting” across the Earth sometimes plowing through oceans and into each other.

Which scientist developed the idea of continental drift a Isaac Newton B Charles Darwin C Albert Einstein D Alfred Wegener?

Lived 1880 – 1930. Alfred Wegener proposed the theory of continental drift – the idea that Earth’s continents move. Despite publishing a large body of compelling fossil and rock evidence for his theory between 1912 and 1929 it was rejected by most other scientists.

Why does oceanic lithosphere Subduct under continental lithosphere whereas continental lithosphere does not Subduct under oceanic lithosphere quizlet?

Why does oceanic lithosphere subduct under continental lithosphere whereas continental lithosphere does not subduct under oceanic lithosphere? The oceanic lithosphere is thinner and denser than the continental lithosphere which is thicker and less dense.

Which type of lithosphere would be more likely to Subduct?

The oceanic lithosphere would subduct because it has a higher density at 3.0 grams per cubic centimeter.

What is ocean ocean convergent boundary?

At an ocean-ocean convergent boundary one of the plates (oceanic crust and lithospheric mantle) is pushed or subducted under the other (Figure 4.6. 1). … It mixes with the overlying mantle and the addition of water to the hot mantle lowers the crust’s melting point and leads to the formation of magma (flux melting).

What type of plate boundary is most likely to occur at mid ocean ridges?

Mid-ocean ridges occur along divergent plate boundaries where new ocean floor is created as the Earth’s tectonic plates spread apart.

When two tectonic plates slide past each other usually between two convergent boundaries it is called?

When two tectonic plates slide past each other the place where they meet is a transform or lateral fault. The San Andreas Fault is one of the best examples of lateral plate motion.

What is the theory of moving lithospheric plates?

The theory of plate tectonics states that the Earth’s solid outer crust the lithosphere is separated into plates that move over the asthenosphere the molten upper portion of the mantle. Oceanic and continental plates come together spread apart and interact at boundaries all over the planet.

What is the meaning of Pangea?

all the Earth

Pangea’s existence was first proposed in 1912 by German meteorologist Alfred Wegener as a part of his theory of continental drift. Its name is derived from the Greek pangaia meaning “all the Earth.”

How did Alfred Wegener prove his theory?

Wegener supported his theory by demonstrating the biological and geological similarities between continents. South America and Africa contain fossils of animals found only on those two continents with corresponding geographic ranges.

Which scientist developed the idea of continental drift quizlet?

Alfred Wegener developed the continental drift hypothesis.

When did Alfred Wegener discover continental drift?

Wegener was a German meteorologist geophysicist and polar researcher. In 1915 he published ‘The Origin of Continents and Oceans’ which outlined his theory of Continental Drift.

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Which scientist is known for posing the idea of continental drift?

Alfred Wegener

It was a century ago this spring that a little-known German meteorologist named Alfred Wegener proposed that the continents had once been massed together in a single supercontinent and then gradually drifted apart. He was of course right.

Why does the oceanic lithosphere Subduct?

Oceanic lithosphere subducts because its overall density is greater than that of the underlying mantle. … -The oceanic lithosphere is denser than the continental lithosphere so it subducts. That means it gets shoved down underneath the overriding plate.

Is oceanic lithosphere or continental lithosphere denser Why is this the case?

The continental lithosphere is thicker (about 150 km). … The oceanic lithosphere consists mainly of mafic crust and ultramafic mantle and is denser than the continental lithosphere for which the mantle is associated with a crust made of felsic rocks.

Why does oceanic lithosphere Subduct and continental lithosphere does not?

The oceanic lithosphere is thicker and denser than the continental lithosphere which is thinner and less dense. The oceanic lithosphere is thinner and less dense than the continental lithosphere which is thicker and denser.

Which type of lithosphere is less dense and does not become subducted at a convergent boundary?

Continent-Continent Convergence – Continental lithosphere does not easily subduct so that when two continents collide the two continents weld together in a suture zone. The continent crust is often thickened because one continent slides a little way under the other.

No matter what smashing two enormous slabs of lithosphere together results in magma generation and earthquakes. Figure 6. Subduction of an oceanic plate beneath a continental plate causes earthquakes and forms a line of volcanoes known as a continental arc.

What is oceanic to oceanic convergence?

An ocean-ocean convergent boundary occurs location where two oceanic plates come together and the denser plate sinks or subducts beneath the less dense plate forming a deep ocean trench. Chains of volcanoes called island arcs form over subduction zone melting occurs where the subducting plate reenters the mantle.

How are oceanic oceanic and Oceanic Continental convergent boundaries different?

The oceanic plate is pushed under the continental plate and melted. … Continental plates are much thicker that Oceanic plates. At the convergent boundaries the continental plates are pushed upward and gain thickness. The rocks and geological layers are much older on continental plates than in the oceanic plates.

How are oceanic oceanic and Oceanic Continental convergent boundaries similar?

a. Oceanic-oceanic convergence occurs deep in the ocean where one oceanic plate is overlapped on top of another oceanic plate causing the formation of trenches. … Oceanic-continental convergence triggers the formation of mountains when a continental plate overlaps an oceanic plate on collision.

What are the results of oceanic oceanic convergent boundaries?

If the two plates that meet at a convergent plate boundary both are of oceanic crust the older denser plate will subduct beneath the less dense plate. … The older plate subducts into a trench resulting in earthquakes. Melting of mantle material creates volcanoes at the subduction zone.

Why is the oceanic crust near the Mid-Atlantic Ridge so much warmer than the oceanic crust near the continents?

Divergent boundaries are spreading boundaries where new oceanic crust is created to fill in the space as the plates move apart. … Because the new crust formed at the plate boundary is warmer than the surrounding crust it has a lower density so it sits higher on the mantle creating the mountain chain.

What happens to the older and denser plate as it continues to slide beneath the earth’s mantle *?

An oceanic-to-oceanic plate boundary occurs when two oceanic plates converge causing the older denser plate will subduct into the mantle. An ocean trench marks the location where the plate is pushed down into the mantle. The line of volcanoes that grows on the upper oceanic plate is an island arc.

What happens when two oceanic plates collide?

A subduction zone is also generated when two oceanic plates collide — the older plate is forced under the younger one — and it leads to the formation of chains of volcanic islands known as island arcs. … Earthquakes generated in a subduction zone can also give rise to tsunamis.

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What happens when two plates slide?

When oceanic or continental plates slide past each other in opposite directions or move in the same direction but at different speeds a transform fault boundary is formed. No new crust is created or subducted and no volcanoes form but earthquakes occur along the fault.

When two oceanic plates converge some magma erupts under the ocean?

Seafloor spreading increases the size of the ocean basin as rifting continues. When two oceanic plates converge some magma erupts under the ocean forming volcanoes that may rise above the sea.

What causes the motion of oceanic oceanic?

The most obvious examples are the waves and ripples on the water’s surface that are generated by wind or the ocean currents that are due to tides. … There currents are set in motion by variations in water density caused by differences in temperature and salinity a process called convection.

Which is true about lithospheric plates?

Lithospheric plates are regions of Earth’s crust and upper mantle that are fractured into plates that move across a deeper plasticine mantle. … Each lithospheric plate is composed of a layer of oceanic crust or continental crust superficial to an outer layer of the mantle.

What is the lithosphere and tectonic plate?

The lithosphere which is the rigid outermost shell of a planet (the crust and upper mantle) is broken into tectonic plates. … Tectonic plates are composed of the oceanic lithosphere and the thicker continental lithosphere each topped by its own kind of crust.

Which of these is false about lithospheric plates Brainly?

Explanation: Lithospheric plates do not have same thickness everywhere because the plates changes its thickness due to intense heat in the Earth’s core as these plates move from Earth’s crust and upper mantle to a deeper plasticine mantle.

The Lithosphere

Structure of Environment : Lithosphere

Plate Tectonic Movement Mechanisms

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