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Evidence
for Water on Mars
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Canyons (not to be confused
with canals, which don't exist)
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Flood plains
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Polar ice caps
-
Top layer of ice cap is probably
frozen CO2 (dry ice)
-
Where is the water now?
-
locked into ice at poles
-
locked into ice in the soil
(permafrost)
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meteor impacts can melt permafrost
-
Liquid water cannot exist
on Mars now
-
atmospheric pressure too
low
-
liquid water would boil away
-
Mars probably had a thicker
atmosphere and was warmer at one time
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