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How Plates Move/Their Boundaries
What Earth is Made of
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Geosphere
Atmosphere
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Layers of the Earth
Crust
Mantle
Outer Core
Inner Core
Fossils
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Weathering, Deposition and Erosion
Earth's History: Geological Timeline
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layers of the earth
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Outer Core
The Mantle
The mantle is the second layer in the Earth. It is semisolid, like taffy and is about 3,000 km thick. The mantle is extremely hot and it moves in currents with the crust called convection currents. The mantle is the thickest layer of the four.