A cave is a natural void beneath the surface of the Earth, most often formed as rock is weathered and slowly dissolved or eroded away, allowing the opening to extend underground over time. Caves that reach only a short distance underground from their opening are called exogene caves, while caves that extend farther inward than their opening is wide are called endogene caves. Similar underground voids have also been observed on other rocky worlds beyond Earth.
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Cave (Wikipedia)
In Discipline: Speleology, Lead paragraph
Caves and caverns are natural voids under the surface of the Earth and have also been observed in other rocky worlds (e.g., on Mars)
Caused By: Weathering, Lead section (caused-by Weathering)
Caves often form by the weathering of rock and can extend deep underground.
In Group: Caves and Cave Systems, Lead paragraph
Caves and caverns are natural voids under the surface of the Earth and have also been observed in other rocky worlds (e.g., on Mars).
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