Discussion
Which of these is the largest of the four inner rocky planets?
Answer: B
Correct answer: Earth
Earth is the largest and most massive of the four terrestrial planets, slightly ahead of Venus, with Mars about half its diameter and Mercury smaller still. The inner planets share a common structure - an iron core, a silicate mantle and a solid crust - and are dense and small compared with the gas giants beyond the asteroid belt. That division arose in the early solar system, when the heat of the young Sun drove volatile material outward, leaving only rock and metal to condense close in. Earth is distinguished among them by liquid water at the surface, plate tectonics, an oxygen-rich atmosphere and a strong magnetic field generated by its liquid outer core - which shields the atmosphere from being stripped by the solar wind, a protection Mars lost. It is also the densest planet in the solar system.
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