earth's crust (地殼)

earth's crust

地殼

earth's crust (地殼)

地殼 (earth's crust)

the earth's crust

地球的外殼

the earth's crust (地球的外殼)

地球的外殼 (the earth's crust)

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thickness of earth's crust

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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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). The temperatures of the crust vary from air temperature on top to about 1600 degrees Fahrenheit (870 degrees Celcius) in the deepest parts of the crust. You can bake a loaf of bread in your oven at 350 degrees Fahrenheit , at 1600 degrees F. rocks begin to melt.

The crust of the Earth is broken into many pieces called plates. The plates "float" on the soft, plastic mantle which is located below the crust. These plates usually move along smoothly but sometimes they stick and build up pressure. The pressure builds and the rock bends until it snaps. When this occurs an Earthquake is the result!

Notice how thin the crust of the Earth is in comparison to the other layers. The seven continents and ocean plates basically float across the mantle which is composed of much hotter and denser material.

Source (資訊來源):

http://volcano.oregonstate.edu/oldroot/education/vwlessons/lessons/Earths_layers/Earths_layers4.html

Info cited on 2016-06-19-WD7 (資訊引用於 中華民國105年6月19日) by 湯偉晉 (WeiJin Tang)

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