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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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Continental crust is part of the Earth?????????s surface found under land masses, and oceanic crust is the surface found under the ocean floor. Oceanic crust is made of dense rock like basalt. Continental crust has rocks... 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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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 »

www.reference.com Science Earth Science Layers of the Earth

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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The most common rocks on top of oceanic plates are basaltic rocks, which are denser than ones found on continents; these are found on top of the oceanic plates because they are pieces of the oceanic plates that have been... More »

www.reference.com Science Earth Science Layers of the Earth

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 »

www.reference.com Science Earth Science Layers of the Earth