Q:

What are four interesting facts about the Earth's crust?

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Quick Answer

The Earth's crust, which is Earth's outermost layer, is a thin layer. Comprised of two kinds of crusts, continental and oceanic crusts, it is merely 0.473 percent of Earth's mass. The ocean crust's thickness is around 7 km, while the continental crust's thickness is from 10 to 75 km.

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Full Answer

The oceanic crust is made of dense rocks, like basalt, and carries water. The continental crust is made of lighter rocks, like granite, and carries land. The oceanic crust gradually sinks until it eventually enters the Earth's mantle; at the mantle, it melts. Later, as magma, it ascends again in the mid-ocean ridges. This is how Earth gets a new oceanic crust every 200 million years.

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Related Questions

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    What causes convection currents in the Earth's mantle?

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    Convection currents in Earth's mantle are caused by the rise of hot material rising towards the crust, becoming cooler and sinking back down. This process occurs repeatedly, causing the currents to constantly flow. The movement of the currents plays a factor in the movement of the mantle.

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  • Q:

    Of what minerals do oceanic tectonic plates consist?

    A:

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    What is the most abundant element in the Earth's crust?

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  • Q:

    What is a break in the Earth's crust called?

    A:

    A break in the Earth's crust is called a fault. According to Dictionary.com, a fault in geology is a fracture in the Earth's crust that results in the displacement and loss of continuity of rocks on either side of the fracture plane. A fault is the result of plate-tectonic forces.

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