What method has been used to determine the most recent time the Tharsis volcanoes on Mars have erupted?
A) measuring the thickness of lava flows on their sides
B) measuring the intensity of infrared radiation emitted by them
C) measuring the changes in sulfur compound concentrations in the planet's atmosphere
D) counting the craters on their slopes

Question

Quizplus · Accepted Answer

The method of counting craters on the slopes of the Tharsis volcanoes on Mars is used to estimate the age of the surface, including the most recent volcanic activity. Fewer craters indicate younger surfaces, suggesting more recent volcanic eruptions.

What Method Has Been Used to Determine the Most Recent