The Terrestrial Planets Are Thought to Have Formed by Accreting

question 92

Multiple Choice

The Terrestrial planets are thought to have formed by accreting solid planetesimals, all with about the same composition. What does this mean?

• 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 and then differentiated into a high-density iron metal core and low-density silicate crust.
• D) They were initially collections of solid particles, which melted and then differentiated into a high-density silicate core and low-density iron metal crust.

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