The surfaces of the inner planets of our solar system seem to be composed of
A) gases.
B) frozen water.
C) frozen carbon dioxide.
D) molten lava.
E) mineral matter.

Question

Quizplus · Accepted Answer

The surfaces of the inner planets (Mercury, Venus, Earth, and Mars) are rocky and composed of mineral matter. This is because these planets are close enough to the sun to have temperatures high enough to melt and vaporize gases and frozen substances. Therefore, rocky material was able to accumulate and form their surfaces.

The Surfaces of the Inner Planets of Our Solar System