The three sources that brought young Earth to its melting point were
A)impact heating,convection heating,radiometric heating.
B)impact heating,gravitational contraction heating,radioactive decay heating.
C)impact heating,convection heating,radioactive decay heating.
D)collisional heating,contraction heating,radiometric heating.

Question

Quizplus · Accepted Answer

The three sources that brought young Earth to its melting point were impact heating caused by the collision with another celestial body, gravitational contraction heating due to the compression of the planet's material, and radioactive decay heating from the decay of radioactive isotopes in the Earth's mantle and core. Choice B correctly includes all three of these sources of heating, while the other options either miss one or include sources that are not relevant to the formation of the Earth.

The Three Sources That Brought Young Earth to Its Melting