Glaciers -- Earth and Mars

At 20 km wide, Byrd Glacier is the largest glacier in the Transantarctic Mountains. It is also one of the fastest moving glaciers in Antarctica, advancing several hundred meters per year. The Mars image is of layered terrain in the north polar area. The polar caps on Mars are made up primarily of frozen CO2 and are much thinner than are polar caps on Earth. Small amounts of water ice are present in the Martian polar caps.

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