What caused Earth to partially melt when being formed?
a. Impact of asteroids, comets, and debris
b. Gravitational compression
c. Accumulation of decaying radioactive elements
d. A combination of all of these choices
ANS: D
Asteroids, comets, and debris heated the surface of Earth. Combined with gravitational compression
and decaying radioactive elements, this caused Earth to partially melt. Information can be found in the
section Earth, Ocean, and Atmosphere Accumulated in Layers Sorted by Density
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