Which factor is NOT believed to be the source of Earth's internal heat energy. That is

Responses
A convection cells.convection cells.
B extraterrestrial impacts.extraterrestrial impacts.
C radioactive decay of isotopes.radioactive decay of isotopes.
D gravitational contraction of Earth's interior.gravitational contraction of Earth's interior.

1 answer

The factor that is NOT believed to be a source of Earth's internal heat energy is:

A. convection cells.

Convection cells are a result of the heat within the Earth, rather than a source of that heat. The other options (extraterrestrial impacts, radioactive decay of isotopes, and gravitational contraction of Earth's interior) are considered sources of Earth's internal heat.