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Caves or caverns are big and large holes in rock. They are usually underground, dark, deep, and wet.
Limestone
Most caves are found in rock called limestone.
Limestone melts in rainwater and groundwater. And it makes largest caves in the world.
Shelter
Ancient people live in big and dry caves.
Caves often offer a safe home to bats.
Caving
Some modern people explore underground caves for a hobby.
It is called caving or spelunking.
cave(cavern) 동굴 / hole 구멍 / limestone 석회석 / melt 녹다 / groundwater 지하수 / ancient 고대의 / bat 박쥐 / offer 제공하다 / caving(spelunking) 동굴탐험
[Feature] Caves
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