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igneous (adj) (of rock) formed by lava from volcanic eruptions.
Igneous rocks are the rocks formed by lava turning solid on cooling. Melted or liquid rocky material lying under earth's surface becomes solid and that forms into a rock. It becomes igneous rock.
- Igneous rocks are found in volcanic areas, especially where volcanoes have been active.
- The earth around igneous rocks are usually rocky with no vegetation, obviously because of the volcanic effect.