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1. Describe where the Earth's internal heat comes from.
2. Identify the sources of Earth's internal heat; namely, radiogenich
primordial heat.
3. Describe the parts and function of Earth's interior.
4. Describe the processes of heat transfer in Earth's mantle.​

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HERE IS THE ANSWER -

1.)heat from when the planet formed and accreted, which has not yet been lost;

2.)the radiogenic heat produced by the radioactive decay of isotopes in the mantle and crust, and the primordial heat left over from the formation of Earth.

3.)the crust, the mantle, and the core. ...

4.)The lower mantle is heated directly by conduction from the core.

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