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Terrestrial, or rocky planets, are often covered with craters. To teach children how craters are formed, take a large baking pan and line the bottom with flour. Layer brownie mix and cornstarch on top of the flour to mimic the layers of a planet's crust. Then, have children take turns sending meteorites into the pan. Marbles, pennies, or erasers work great. The resulting craters and ejecta matter show the how objects from space impact the surface of a planet.