Question

How do observations of Mars suggest that liquid water may have once existed on its surface?

A) Evidence of Ancient Oceans, Martian Polar Caps
B) Martian Volcanic Activity, Dry Riverbeds
C) Geological Shifts, Martian Deserts
D) Evidence of Liquid Methane, Martian Geysers

Answer 1

Observations of Mars suggest the existence of liquid water on its surface through evidence of ancient oceans, Martian polar caps, and dry riverbeds.

Step-by-step explanation:

Mars has evidence suggesting that liquid water may have once existed on its surface through several observations:

1. Evidence of Ancient Oceans: The rovers such as Spirit, Opportunity, Curiosity, and Perseverance have explored dried-out lake beds and sedimentary rocks that indicate the presence of ancient oceans on Mars when the climate was warmer.

2. Martian Polar Caps: Mars has polar caps that contain primarily water ice, suggesting that water may have been present on the surface in the past.

3. Dry Riverbeds: Mars has geological features such as channels, gullies, and riverbeds that indicate the presence of flowing water in the past. These features are remnants of ancient watercourses and suggest intermittent outbreaks of liquid water even today.