A basin, impact basin, impact crater, astrobleme or crater is a circular or oval depression on the surface of a planet, moon, asteroid, or other celestial body, caused by a collision of a smaller body (meteor) with the surface.
Over time, the gradual processes that change planetary surfaces will act to cover the effects of impacts. Erosion by wind, water, and other fluids, deposits of wind-blown sand and water-carried sediment, and lava flows in due time tend to obscure or bury the basin.
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