In 2012, Curiosity found strong evidence for an ancient streambed. This was:
A)dry gullies along crater walls.
B)rounded pebbles.
C)sedimentary rocks.
D)dry flood channels from an impact crater.

Question

Quizplus · Accepted Answer

The presence of rounded pebbles is a strong indication that they were shaped by water, suggesting the existence of an ancient streambed. Dry gullies along crater walls and dry flood channels from an impact crater could also be caused by other processes such as wind erosion or landslides, while sedimentary rocks alone do not necessarily indicate the presence of water.

In 2012, Curiosity Found Strong Evidence for an Ancient Streambed