This image shows sand in the Martian terrain.
Click on image for full size
Image from: JPL/NASA
Martian Sand
Fluvial environments (water) are the origin of sand grains on Earth, but what of Mars? Sand grains of Mars come from basalt. They seem to be particles which are cemented together, rather than rounded crystalline fragments such as sand grains on Earth.
Sand is an important agent of erosion, although another important weathering mechanism on Mars is Acid Fog.
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