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phe2rpana4shjessHama phe2rpana4shjessHama
  • 25-03-2016
  • Geography
contestada

Exit Which of the following is NOT a source of Earth's internal heat?
a. mantle convection
b. radioactive substances
c. gravitational contraction
d. past bombardment by asteroids

Respuesta :

masonhamilton7 masonhamilton7
  • 25-03-2016
it is b 
radioactive substances don't heat the earth
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