Magma

Science / Geology / Magma: Molten rock material that forms igneous rocks upon cooling. Magma that reaches the surface is referred to as lava.

Magmatic Water

Science / Geology / Magmatic Water: Water that is dissolved in a magma or water that is released from a magma. Some magmas can contain up to several percent dissolved water by weight. MORE

Phreatomagmatic

Science / Geology / Phreatomagmatic: An explosive volcanic eruption initiated by the interaction of magma and water (usually either meteoric or groundwater). MORE

Magma Chamber

Science / Geology / Magma Chamber: A full or emptied magma reservoir in the shallow portion of the lithosphere. MORE

Caldera

Science / Geology / Caldera: A large, bowl-shaped crater associated with a volcanic vent. A caldera can form from a volcanic blast or the collapse of a volcanic cone into an emptied magma chamber. MORE

Xenolith

Science / Geology / Xenolith: A preexisting rock that has been incorporated into magma without melting. When the magma crystallizes the preexisting rock fragment is known as a xenolith. MORE

Pegmatite

Science / Geology / Pegmatite: A very coarse grained igneous rock, normally of granitic composition. Typically forms during the final states of magma chamber crystallization when the high water content solutions allow rapid crystal MORE

Links
Home
Glossary
Thesaurus