Structure of the Earth

你需要知道的

• By composition the Earth has three main layers: a thin rocky crust, the mantle and the core.
• Oceanic crust is thin and made of dense basalt, while continental crust is thicker and rich in less dense granite.
• The mantle is hot solid rock that can flow very slowly; the core is mostly iron and nickel, with a liquid outer core and a solid inner core.
• The crust and upper mantle form the rigid lithosphere, which is broken into tectonic plates that move on the asthenosphere.

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