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What are the proofs that the interior of the earth is hot?

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Radioactivity . weight of the interior rocks.during the formation of the earth is still retained 
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Due to radio activity
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Radio activity   
Overlying material
Origin of the heat is still retain

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Radloactlvlty

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The intial heat is still retained.                    Due to radioactivity.                                   The weight of the overlying rocks.            
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1.radioactivity
2.original heat retained by the earth
3.weight of the overlying crustal rock 
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Radioactivity that generates a lot of heat
Weight of the overlying rocks that generates pressure creates heat
Heat formed during the formation of the earth is still retained as it cools in slow rate in earth's interior 
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Radio activity is still taking place
Originall heat is retained

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Because of radio activity
Because of the law lying rocks

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Radioactivity 
The weight of overlying rocks
The exterior of the earth cooled faster than the interior hence heat is retained

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