5005 Praxis Practice Test Practice Question
Of the following, which is most likely to be composed primarily of ice?
Correct Answer: C
Rationale: Comets are primarily composed of ice, dust, and rocky material, earning them the nickname "dirty snowballs." When they approach the Sun, the heat causes the ice to vaporize, creating a glowing coma and tail.
Asteroids (A) are mostly rocky or metallic, lacking significant ice content. A red dwarf (B) is a type of star, primarily composed of hydrogen and helium, not ice. The planet Mercury (D) has a rocky surface with minimal ice, primarily found in permanently shadowed craters. Thus, comets are the most ice-rich among the options provided.
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