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The Earth's Crust: Everything You Need to Know - ThoughtCo
2019年1月25日 · In general, then, there are two kinds of crust: oceanic crust (basaltic) and continental crust (granitic). An illustration of oceanic crust. Dorling Kindersley/Getty Images. Oceanic crust covers about 60 percent of the Earth's surface. Oceanic crust is thin and young -- no more than about 20 km thick and no older than about 180 million years.
Crust - Education | National Geographic Society
2024年4月25日 · Earth has three layers: the crust, the mantle, and the core. The crust is made of solid rocks and minerals. Beneath the crust is the mantle, which is also mostly solid rocks and minerals, but punctuated by malleable areas of semi-solid magma. At the center of Earth is a hot, dense metal core.
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