Terrestrial Planets Are Thought to Have Dense Iron Cores Because

question 30

Multiple Choice

Terrestrial planets are thought to have dense iron cores because

• A) the accumulation of material into planets in the original solar system nebula would have begun with the heavier elements,to be followed later by lighter materials.
• B) magnetism in iron would be sufficiently powerful to pull more iron into the center of the forming planet.
• C) thermonuclear processes produced iron in the earlier phases of planetary formation.
• D) in earlier molten states,the heavy elements sank and lighter materials floated to the surface by chemical differentiation.

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