What is the size of earth's crust?
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The oceanic crust is 5 km (3 mi) to 10 km (6 mi) thick and is composed primarily of basalt, diabase, and gabbro. The continental crust is typically from 30 km (20 mi) to 50 km (30 mi) thick, and it is mostly composed of less dense rocks than is the oceanic crust.
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The Earth's Crust is like the skin of an apple. It is very thin in comparison to the other three layers.
The crust is only about 3-5 miles (8 kilometers) thick under the oceans( oceanic crust ) and about 25 miles (32 kilometers) thick under the continents ( continental crust ).
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