The layers of earth's geosphere are defined based on chemical composition and physical properties.
Chemical composition and physical properties are used to categories the strata that make up the geosphere. The layer of Earth comprised of solid rock and other hard materials is known as the geosphere. But it's also a good idea to start thinking about the geosphere from the stratosphere.
It is easiest to think of the geosphere as any portion of the solid, physical Earth that is not the hydrosphere (such as the water found in oceans, lakes, and rivers) or the atmosphere (the layer of gases that separates the ground from space). The crust, which characterizes the earth's rigid outer layer, is often used interchangeably with the term geosphere.
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