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A. decay of radioactive materials
B. residual heat from the formation of the earth
C. neither a nor b
D. both a and b

2007-09-05 10:30:15 · 1 answers · asked by Nicole 1 in Science & Mathematics Physics

1 answers

d

2007-09-05 10:53:15 · answer #1 · answered by J C 5 · 0 0

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