Results from the Mars Exploration Rovers Spirit and Opportunity suggest that liquid water
A) has never existed in significant quantities on the surface of Mars
B) was once plentiful on the surface of Mars
C) is only present in the Tharsis region of Mars
D) is present in large quantities beneath the Martian surface today

Question

Quizplus · Accepted Answer

The Mars Exploration Rovers found evidence of past water activity on the surface of Mars, including the presence of minerals that can only form in the presence of liquid water. This suggests that water was once plentiful on Mars.

Results from the Mars Exploration Rovers Spirit and Opportunity Suggest