Jupiter's satellite Io has numerous black spots on its surface. What are these spots?
A) volcanic vents
B) impact craters
C) collapsed features in an icy crust
D) debris from comets

Question

Quizplus · Accepted Answer

These black spots are volcanic vents. Io is the most volcanically active body in the Solar System, and these vents release sulfur and sulfur dioxide, giving Io its distinctive appearance.

Jupiter's Satellite Io Has Numerous Black Spots on Its Surface