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Earth’s Systems

Scientists who study Earth have identified four main Earth systems: the lithosphere, the hydrosphere, the atmosphere, and the biosphere.

Earth Science

1.The Lithosphere

Earth’s lithosphere is the rigid outer shell of the planet and includes the crust and the solid, uppermost part of the layer below the crust, the mantle.

There are two kinds of crust: continental crust, made mostly of granite, and oceanic crust which is primarily basalt.

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