Why do scientists believe there was once liquid water on Mars?
A) Depositional landforms are seen on Mars, but not erosional landforms.
B) Landforms such as river channels and sandbars are seen on Mars.
C) Large depressions are seen on Mars that were once large lakes.
D) There has been evidence of marine life found in the rocks on Mars.

Question

Quizplus · Accepted Answer

Scientists believe there was once liquid water on Mars because landforms such as river channels and sandbars are visible on the planet, indicating the presence of flowing water in the past.

Why Do Scientists Believe There Was Once Liquid Water on Mars