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Caves

Caves are large, natural holes beneath the surface of the earth. Underground passages and caves are found in rocky landscapes across the world. They are found in areas with a lot of limestone, a common type of rock. They can be created in various ways, but most caves are hollowed out of rock by water. Water seeps through the ground and forms holes below the surface. Water that is loaded with stones grinds away the rock like sandpaper, or acidic rainwater eats away at the rock. Some early people used caves to shelter from the weather or to hide from wild animals. Some of these early people made cave paintings.