What is the process of accretion?
A) the separation of materials in a protoplanet by density, with dense material in core
B) growth of an object by the accumulation of matter
C) the breakup of large objects by violent collisions with other similar-sized objects
D) the period of time during which the Sun swept away all the excess material in the solar nebula
E) the process by which the solar nebula became heated during its collapse
Question 2
Venus and Mars probably evolved differently from Earth because
A) they are slightly bigger than Earth.
B) they are more massive than Earth.
C) they have thicker atmospheres than the Earth.
D) they formed sooner than Earth.
E) they orbit at different distances from the Sun.
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