3. what primarily contributed to the internal heat of the early earth?\nsolar radiation\ngravitational…

3. what primarily contributed to the internal heat of the early earth?\nsolar radiation\ngravitational contraction and radioactive decay\nlightning strikes\natmospheric pressure

3. what primarily contributed to the internal heat of the early earth?\nsolar radiation\ngravitational contraction and radioactive decay\nlightning strikes\natmospheric pressure

Answer

Brief Explanations:

The early Earth's internal heat was mainly due to gravitational contraction during its formation and heat - generating radioactive decay of elements within the Earth. Solar radiation affects the Earth's surface, lightning strikes are short - term electrical events in the atmosphere, and atmospheric pressure is related to the weight of the atmosphere and not a primary source of the Earth's internal heat.

Answer:

Gravitational contraction and radioactive decay