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Lava

A lava lake at Mount Nyiragongo in the Democratic Republic of the Congo
Valentine Cave in Lava Beds National Monument, California shows the classic tube shape; the grooves on the wall mark former flow levels.
The Simple English Wiktionary has a definition for: lava.

Lava is magma, hot molten rock that flows through holes in the Earth's crust and onto the surface. Like magma, lava can be either viscous (~thick) or fluid (~thin).[1] Blocky lava is so thick and slow that it barely moves along the ground. Other types of lava, like pahoehoe, aa, and pillow lava, are thinner and flow faster.[1] Lava sometimes sets things on fire. Sometimes it even destroys towns.

  1. ↑ 1.0 1.1 Earth Science. Holt, Rinehart and Winston, Austin, Texas. 2001. ISBN 0-03-055667-8.

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