Lava tubes
Topic: Category
From Wikipedia - Reading time: 1 min
Lava tubes are caves which are formed in volcanic rock. They are usually the voids left when the molten lava cools and contracts.
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Licensed under CC BY-SA 3.0 | Source: https://en.wikipedia.org/wiki/Category:Lava_tubes11 views | ↧ Download as ZWI file
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