about cave house full details in English
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A cave is a natural underground hollow space. They can have narrow passageways and chambers (caverns). They are usually formed when underground acidic (sour) water wears away softer stones, such as limestone. Only the hard rock, such as granite, is left. Caves can also be formed during natural catastrophes, such as earthquakes, or by ice and glaciers.
In the past, people lived in caves. People used to live in many European caves in the Stone Age. Caves still provide shelter for trekkers. Some caves have beautiful paintings on the walls.
People who explore caves are called cavers or speleologists. (The study of caves is called speleology.)
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