How does thermal energy affect the earth's layers?

The thermal energy of the Earth remains from its formation and is continuously generated from radioactive decay of long-lived radionuclides in the Earths interior. The deeper the Earth layers the higher the temperature with the geothermal gradient of temperatures through the Earth’s crust on average as high as 25–30°C/km.

Explanation:

ocean expansion, global warming is melting icebergs and causing water levels to rise.

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