volcanic caves
Underground lava passages
Volcanic caves are cavities formed by volcanic activity, most commonly lava tubes—tunnels created when the surface of a lava flow cools and hardens while molten rock continues flowing beneath, eventually draining out.
Other types form from gas bubbles, lava molds around trees, or erosion of volcanic rock.
The volcanic caves on Hawaii's Big Island attract thousands of visitors annually.
- lavaErupted liquid stone
- lava tubesTunnels formed by flowing magma
- magmaMolten rock underground
- tubesHollow cylindrical containers
- basaltFine-grained volcanic stone
molten rock · underground · molten · eruption · obsidian · stalactites · darkness · hidden world · geothermal · Hawaii · Big Island · sulfur · underground river · skylights · flowstone · craters · subterranean · spelunking
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