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Denser objects and substances experience a greater gravitational force acting upon their mass. This is why materials of different densities form layers. ... It is less dense than the Earth's crust, which is a solid. This is why the Earth's surface and atmosphere form distinct layers.

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Answer:

The materials that make up the earths layers have different densities. The more dense the object is, the more gravity is acting upon that object and/or substance. For Example, The Crust. It is a solid, so it is more dense. That is why there are layers, because of Gravity and how dense an object is.

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