What Is The Name Of The Type Of Basaltic Crust That Moves Under Less Dense Crust?


Which type of crust is less dense?

continental crust

The continental crust is also less dense than oceanic crust although it is considerably thicker. As a consequence of the density difference when active margins of continental crust meet oceanic crust in subduction zones the oceanic crust is typically subducted back into the mantle.

What is the name of the type of crust that is less dense and sits higher up?

Continental crust is less dense than oceanic crust therefore the continental crust sits above the oceanic crust making continents. The more dense oceanic crust is below the continental crust and forms ocean basins. Continental crust is made up of many different types of igneous metamorphic and sedimentary rocks.

What type of crust is thinner and less dense?

Oceanic crust

Oceanic crust is generally composed of dark-colored rocks called basalt and gabbro. It is thinner and denser than continental crust which is made of light-colored rocks called andesite and granite. The low density of continental crust causes it to “float” high atop the viscous mantle forming dry land.

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Which lithosphere crust is thick and less dense?

oceanic crust

There are two main types of crust continental crust and oceanic crust that differ in a number of ways. Continental crust is thicker than oceanic crust averaging 20-70 km thick compared to 5-10 km for oceanic crust. Continental crust is less dense than oceanic crust (2.7 g/cm3 vs. 3 g/cm3) and it is much older.

What crust is denser?

Oceanic crust
Oceanic crust is thinner and denser than continental crust. Oceanic crust is darker in color and denser (more mafic). Continental crust is lighter in color and density (more felsic).Nov 12 2018

Why is the crust less dense?

Continental crust is less dense because of its composition. Continental crust is made up of felsic material (SiO4)– mainly granite. The density of continental crust is 2.9 g/cm^3. Oceanic crust while thinner is made of mafic materials (Fe Mg)– mainly basalt.

Which is denser oceanic crust or continental crust?

Continental crust is also less dense than oceanic crust though it is considerably thicker mostly 35 to 40 km versus the average oceanic thickness of around 7-10 km.

What is continental crust and oceanic crust?

The crust is the outer layer of the Earth. It is the solid rock layer upon which we live. Continental crust is typically 30-50 km thick whilst oceanic crust is only 5-10 km thick. … Oceanic crust is denser can be subducted and is constantly being destroyed and replaced at plate boundaries.

Is mantle denser than crust?

The mantle which contains more iron magnesium and calcium than the crust is hotter and denser because temperature and pressure inside the Earth increase with depth.

Why is oceanic crust denser?

In the ocean wherever ridges are tectonic plates tend to drift away and this causes molten magma to rise. It in turn leads to the formation of new oceanic crust. But then as this crust tends to drift away with time it starts to age and its temperature reduces. As time goes by it becomes denser.

Which crust is the thinnest and denser?

Oceanic crust
Oceanic crust is thinner and denser than continental crust. Oceanic crust is more mafic continental crust is more felsic.

How dense is the oceanic crust?

3 grams per cubic centimeter

Oceanic Crust

(Basalts are a sima rocks.) Oceanic crust is dense almost 3 grams per cubic centimeter (1.7 ounces per cubic inch).

Which is thicker but less dense and oceanic crust which is thinner but denser?

continental crust

Oceanic crust is thinner and denser than continental crust. Oceanic crust is thicker and less dense than continental crust.

Is the oceanic lithosphere lighter than continental lithosphere?

A theory of global tectonics in which the lithosphere is divided into a number of crustal plates each of which moves on the plastic asthenosphere more or less independently to collide with slide under or move past adjacent plates. … Oceanic lithosphere is lighter than continental lithosphere.

Is oceanic lithosphere or continental lithosphere denser?

Oceanic lithosphere is associated with oceanic crust and is slightly denser than continental lithosphere. The most well-known feature associated with Earth’s lithosphere is tectonic activity.

Which type of crust is more dense Why?

Oceanic crust is denser because it generally melts to a higher fraction than continental crust. When rocks melt to 20–30% like they do at mid-ocean ridges the result is more dense than when rocks melt to form continental plates which is typically 1–5%.

Is oceanic crust less dense than continental crust?

Continental crust is broadly granitic in composition and with a density of about 2.7 grams per cubic cm is somewhat lighter than oceanic crust which is basaltic (i.e. richer in iron and magnesium than granite) in composition and has a density of about 2.9 to 3 grams per cubic cm.

Which crust is thicker what makes it denser than the other?


Oceanic crust is thinner and denser than continental crust. Oceanic crust is darker in color and denser (more mafic).

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What type of crust is found under the oceans?

oceanic crust the outermost layer of Earth’s lithosphere that is found under the oceans and formed at spreading centres on oceanic ridges which occur at divergent plate boundaries.

Why does oceanic crust sink below continental crust?

When an oceanic plate converges with a continental plate the oceanic crust will always subduct under the continental crust this is because oceanic crust is naturally denser. … This melting leads to heat being transferred upwards and uplifting the crust eventually developing into a volcano.

Which type of plate is most dense oceanic or continental?

Oceanic plates under the ocean are made of basalt rock and are more dense than continental plates under land masses. We learned that when an oceanic plate collides with a continental plate the oceanic plate creates a subduction zone diving under the continental plate.

What is another name for the continental crust?

This layer is sometimes called sial because its bulk composition is richer in aluminium silicates and has a lower density compared to the oceanic crust called sima which is richer in magnesium silicate minerals and is denser.

What makes the crust move?

Earth’s crust called the lithosphere consists of 15 to 20 moving tectonic plates. … The heat from radioactive processes within the planet’s interior causes the plates to move sometimes toward and sometimes away from each other. This movement is called plate motion or tectonic shift.

How dense is the lithosphere?

The density of the lithosphere varies depending on temperature depth and age. At about 50 kilometers (30 miles) below the Earth’s surface density measurements reach 200 000 pounds per square inch (13 790 bars).

Is the outer core less dense than the mantle?

The outer core is made up of slightly less dense material compared with the inner core the lower mantle is less dense than the outer core the upper mantle is less dense than the lower mantle and so on with the crust being the least dense and lightest portion of our Earth.

What is thinner but denser plate?

Explanation: Oceanic crust is thinner denser younger and has a different chemical composition than continental crust for various reasons. … The oceanic crust is the topmost layer of a tectonic plate’s oceanic section. The oceanic lithosphere is made up of the crust and the solid mantle layer.

What is the thinnest layer?


*Inner core

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It is the thinnest layer of the Earth. *The crust is 5-35km thick beneath the land and 1-8km thick beneath the oceans.

What are the type of crust?

Earth’s crust is divided into two types: oceanic crust and continental crust. The transition zone between these two types of crust is sometimes called the Conrad discontinuity. Silicates (mostly compounds made of silicon and oxygen) are the most abundant rocks and minerals in both oceanic and continental crust.

What is the thinnest layer of the atmosphere?


The troposphere is also the thinnest layer only about 10 miles high. The second layer up from the ground is the stratosphere. This layer extends from about 10-30 miles and unlike the troposphere it increases in temperature with elevation.

Where is oceanic crust density?

3.0 g/cm3

The average density of oceanic crust is 3.0 g/cm3 while continental crust has an average of 2.7 g/cm3.

What is the density and composition of the oceanic crust?

It is thinner than continental crust or sial generally less than 10 kilometers thick however it is denser having a mean density of about 3.0 grams per cubic centimeter as opposed to continental crust which has a density of about 2.7 grams per cubic centimeter.

What is the difference between continental and oceanic lithosphere?

The difference is that the oceanic lithosphere is that which is formed by oceanic crust and residual mantle. … In contrast the continental lithosphere: It is the one that is formed by continental crust and residual mantle. It is what constitutes the continents. It has an average thickness of about 150 km.

What is continental lithosphere and oceanic lithosphere?

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.

What is the fundamental difference between oceanic crust and oceanic lithosphere?

Oceanic and continental crust are formed by entirely different geological processes: the former is typically 6 – 7 km thick the latter about 35 – 40 km. The lithosphere is the rigid outer layer of the Earth required by plate tectonic theory.

Types of Crust

Why is the thin oceanic crust denser? All you need to know about the earth’s crust

The Different Types of Crust


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