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Continental and oceanic crust are both destroyed in subduction zones and lie atop Earth's mantle, though they differ in thickness, density, age and chemical composition. A subduction zone is an area of Earth's crust wher... More »

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The asthenosphere is between 250 and 400 miles thick. It is part of the Earth known as the Upper Crust, which is defined as anything as deep as 416 miles. More »

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Oceanic crust is the portion of the Earth's crust that is found underneath the ocean floor. This part of the Earth's crust has a thickness of approximately 4 miles and is generally made up of denser types of rocks, such ... More »

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The continental crust is the outer layer of the Earth's surface, which consists of several types of rock. It is comprised of 15 tectonic plates that form the continents and their surrounding seabeds, which are called con... More »

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The thickness of the Earth's crust varies with location and ranges from 1 to 80 kilometers thick. The continental crust is 50 kilometers thick on average, while the oceanic crust typically reaches no more than 20 kilomet... More »

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The Department of Earth and Ocean Sciences at the University of British Columbia defines geology as the study of the Earth and its composition, which includes the crust. A geologist covers everything from studying the ti... More »

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Basalt is the main type of rock in the oceanic crust. Basalt is formed when magma cools quickly at the Earth's surface, making a type of igneous rock. More »

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