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quick question?

What is the source of heat in the Earth's mantle?

(This is for a crossword puzzle but I can't find the answer anywhere. It should start with an R and the word consists of 13 letters)

2007-10-30 13:55:48 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Earth Sciences & Geology

1 answers

Radioactivity

2007-10-30 14:04:03 · answer #1 · answered by Irv S 7 · 0⤊ 0⤋

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