volcanic rocks
Solidified molten earth
Volcanic rocks are rocks formed from cooled lava or volcanic ash.
They include basalt, pumice, and obsidian, distinguished by texture and cooling speed—rapid cooling produces fine-grained or glassy rock, while slower cooling allows larger crystals to form.
The Hawaiian islands are built almost entirely of volcanic rocks.
- andesiteIntermediate volcanic rock
- rhyolitePale volcanic igneous rock
- basaltFine-grained volcanic stone
- tuffSolidified volcanic ash
- vesicularHaving small sacs
pumice · extrusion · pyroclastic · tephra · mid-ocean ridge · hot spot · stratovolcanoes · ring of fire · eruption · scoria · magma · cinder cones · soil amendment · obsidian · glassy · igneous rocks · molten · aa
- geology exhibitsmetamorphic rocks, sedimentary rocks, petrified wood, dinosaur bones, meteorites
- geologybedrock, fault lines, faults, basalt, metamorphic rocks
- rocksbasalt, granite, sandstone, marble, shale
- volcanicslava, magma, volcanoes, eruptions, lava flows
- volcanic geologylava, magma, crater, caldera, calderas
- petrologypetrology, igneous rocks, metamorphic rocks, sedimentary rocks, petrography
rock formation process
volcanic rockssedimentary rocks
Stone formed from deposits
sedimentary layers · limestone · sandstone · metamorphic rocks · shale