The terrestrial planets are thought to have formed by accreting solid planetesimals all with about the same composition. This means
a. they were initially molten forming an iron core first, then they accreted a silicate crust later.
b. they were initially molten forming a silicate core first, then they accreted an iron crust later.
c. they were initially collections of solid particles which melted then differentiated into a high density iron metal core and low density silicate crust.
d. they were initially collections of solid particles which melted then differentiated into a high density silicate core and low density iron metal crust.
C
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