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Lava - Wikipedia The solid volcanic rock resulting from subsequent cooling of the molten material is often also called lava A lava flow is an outpouring of lava during an effusive eruption (An explosive eruption, by contrast, produces a mixture of volcanic ash and other fragments called tephra, not lava flows )
What is lava made of? | Volcano World | Oregon State University Lava is made up of crystals, volcanic glass, and bubbles (volcanic gases) As magma gets closer to the surface and cools, it begins to crystallize minerals like olivine and form bubbles of volcanic gases
Lava Flows - Woods Hole Oceanographic Institution When a volcano erupts, the molten rock that comes out of the Earth is called lava Lava is so hot, it remains molten and flows until it cools and hardens into rock
What is a lava? - The Institute for Environmental Research and Education Lava is molten rock that has erupted onto the Earth’s surface (or the surface of another planet or moon) This extrusive igneous rock, distinguished from magma (molten rock beneath the surface), solidifies upon cooling, forming various volcanic rock formations The Essence of Eruption: Understanding Lava’s Composition and Behavior
Geology dictionary: lava - VolcanoDiscovery Molten rock, called magma, is called lava when it reaches the surface during a volcanic eruption Depending on how the magma erupts, it can form lava flows, lava fountains, lava lakes, or be fragmented into scoria and ash during explosive eruptions
Lava - New World Encyclopedia The hardened formation is called " lava flow," whereas the material that still contains molten rock is called an " active lava flow " The rock formed from solidified lava (or magma) is called igneous rock
What Is Lava Made Of? - Ask An Earth and Space Scientist What Is Lava Made Of? Looking down at a cooled lava flow, you see a black, glassy, vesicular (“spongy”) rock The black color comes from the magnesium and iron-rich minerals, which are present in almost all types of lava flows The glassy appearance means the lava cooled quickly