9
practice examMultiple Choice

Practice Exam

Question 9 • Earth and Space Science

A probe detects that Pluto's surface shows active changes rather than being static and frozen. What inference can scientists make from this discovery?

Answer
A
Pluto's orbit will soon carry it out of the solar system entirely.
B
All outer planets have surfaces identical to Pluto's.
C
Pluto has the same surface features as Earth's Moon.
D
Distant icy bodies may be more dynamic than previously believed.

Explanation

If Pluto’s surface is changing, then its icy landscape is not simply static and frozen. This suggests that other distant icy bodies may also have active processes, so scientists may need to view them as more dynamic than previously believed. The discovery does not imply that Pluto will leave the solar system or that other worlds have identical surfaces.

AI-written and checked against the verified answer.

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