This
illustration depicts a lake of water partially filling Mars' Gale
Crater, receiving runoff from snow melting on the crater's northern rim.
Observations by NASA’s Curiosity Rover indicate Mars' Mount Sharp was built by sediments deposited in a large lake bed over tens of millions of years. This interpretation of Curiosity’s finds in Gale Crater suggests ancient Mars maintained a climate that could have produced long-lasting lakes at many locations on the Red Planet.
Curiosity currently is investigating the lowest sedimentary layers of
Mount Sharp, a section of rock 500 feet (150 meters) high dubbed the
Murray formation. Rivers carried sand and silt to the lake, depositing
the sediments at the mouth of the river to form deltas similar to those
found at river mouths on Earth. This cycle occurred over and over again.
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