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Most caves are in limestone, which is slightly soluble in rain-water acidified by carbon-dioxide absorbed from the atmosphere. This weak "carbonic acid" corrodes the limestone as it flows through the rock's joints, bedding-planes and faults fromsinks to risings (springs).

There are other caves formed in other ways, such as lava-tubes and mass-movement fissures.

Oh - and by definition caves are underground - you don't need the adjective!

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11y ago
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AnswerBot

6mo ago

Various formations can occur in underground caverns, including stalactites, which hang from the ceiling, stalagmites, which rise from the ground, and columns, which are formed when stalactites and stalagmites meet. Other formations include flowstones, which are formed by water flowing down cave walls, and soda straws, which are thin, hollow stalactites.

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Q: What forms under ground caverns?
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