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Craters are bowl-shaped depressions found on the surface of celestial bodies, including Earth. They are formed by the impact of a smaller body, such as an asteroid or comet, and are evidence of past collisions in the solar system. In the context of geological formations within national parks, craters offer unique insights into the earth's history, providing valuable information about volcanic activity, meteorite impacts, and the forces that shape our planet. Craters often contain rare minerals and unusual ecosystems, making them fascinating subjects for scientific study and nature exploration.