Do the volcanoes on Mars have active magma vents or chambers below the surface that we can't see but are picked up by the instruments on the orbiters?

Just how usable is the water at the poles? Is it economical to process it for oxygen, water and hydrogen, and are their any additional dangers of a manned mission closer to the poles?

Has it been proven or disproven that there is water beneath Mars surface?

Has anyone tried to melt the ice found on Mars and drink its water?

why long time ago, mars had water? is the atmosphere a important factor?. what is the reason? we can find water nowadays?

Why we can see the water channels on mars as dark lines on the surface ?

Do you think that we could have trees and oxygen and flowing waters like we have on Earth? If not what's going to happen to our cultures i.e. fishing, swimming??

is it right that someone has found ice?

Is there water on Mars

what would be the most efficent way to get oxygen on mars? from the air, soil, or ice?