Geologists think that the eroded surfaces, alluvial fans, and Valles Marineris indicate that the Martian climate was once __________ and that __________ flowed across the surface.
A) colder, liquid metallic hydrogen
B) colder, water
C) warmer, liquid metallic hydrogen
D) warmer, water

Question

Quizplus · Accepted Answer

The presence of eroded surfaces, alluvial fans, and Valles Marineris indicate that water once flowed on the Martian surface. These features are consistent with the erosion and deposition processes seen on Earth caused by the flow of water. Additionally, the presence of minerals like hematite and clay also suggest the past presence of water on Mars. The fact that these features exist on Mars suggests that the planet was once warm enough to sustain liquid water on its surface.

Geologists Think That the Eroded Surfaces, Alluvial Fans, and Valles