Question

question 24
which of the following does not provide evidence that mars once had abundant liquid water on its surface?

• the presence of features that look like dried - up river beds
• the presence of blueberries hematite - rich pebbles which only form in wet conditions
• the presence of residual pools of water right on the surface of the volcanic plains
• the presence of a permafrost revealed by hydrogen maps & by fresh gullies on craters (probably caused by impacts heating the frozen water)

Explanation:

The presence of residual pools of water right on the surface of the volcanic plains indicates current water presence rather than evidence that Mars once had abundant liquid water. Dried - up river beds, hematite - rich pebbles that form in wet conditions, and a permafrost revealed by hydrogen maps and fresh gullies (likely due to impact - heated frozen water) all suggest past abundant liquid water.

Answer:

the presence of residual pools of water right on the surface of the volcanic plains