Evidence for very recent water erosion on Mars comes from the observations of
A) dark streaks on crater walls
B) channels carved on the slopes of volcanoes
C) dried up river beds on the highlands
D) mud flows surrounding craters

Question

Quizplus · Accepted Answer

Dark streaks on crater walls, known as recurring slope lineae (RSL), have been observed to lengthen and darken during warm seasons, suggesting the flow of liquid water. This is strong evidence for very recent water erosion on Mars. Channels on slopes of volcanoes and dried up river beds on the highlands indicate past water activity on Mars, but may not necessarily be recent. Mud flows surrounding craters are also a type of water erosion, but there is no evidence indicating these as recent events.

Evidence for Very Recent Water Erosion on Mars Comes from the Observations