Water seeping to the surface during the Martian summer might boil so violently it blasts dust off the ground,helping to explain the size of the streaksMysterious streaks that appear on the steep slopes of Mars may form when seeping water boils with such violence that it blasts dust off the ground.
The seasonal tracks arrive into being in the summer months on Mars and grow for hundreds of metres down cliffs, gullies and crater walls, or before they vanish again in the winter.
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Source: theguardian.com