Chapter 32, Problem 6RAT

What evidence tells us that Mars was at one time wetter than it presently is?

(a) The frozen polar ice caps.

(b) Recorded history that Mars was once blue.

(c) Dried-up ocean beds and river channels.

(d) A halo of water vapor in orbit around the planet.

To determine

The correct option for the statement “What evidence tells us that Mars was at one time wetter than it presently is?”.

Answer to Problem 6RAT

The correct option for the statement “What evidence tells us that Mars was at one time wetter than it presently is” is option (c).

Explanation of Solution

Mars is next to Earth in the order of the distance from the Sun. Mars is known as a red planet as the quantity of iron oxide is more on its surface and with the keen observation, it was found red. News on Mars about water on it comes after day and doesn’t surprise many people.

The evidence of the prints of lakes, rivers on Mars evident that sometime in the past, there was water on Mars that is no longer available on its surface now. The scientists use an imaging spectrometer on MRO to see streaks on the Red Planet.

Conclusion:

Therefore, the correct option for the statement “What evidence tells us that Mars was at one time wetter than it presently is” is option (c).