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'''Lava''' is the term for [[magma]] from the [[Earth]]'s [[mantle]] when it erupts onto the Earth's surface. Lava differs from magma in that it contains less dissolved gases, due to the decreased pressure at the surface. [[Geologists]] also use the word to describe the solidified deposits of lava flows and fragments hurled into the air by explosive eruptions (for example, [[lava bombs]] or blocks).
'''Lava''' is the term for [[magma]] from the [[Earth]]'s [[mantle]] when it erupts onto the Earth's surface. Lava differs from magma in that it contains less dissolved gases, due to the decreased pressure at the surface. [[Geologists]] also use the word to describe the solidified deposits of lava flows and fragments hurled into the air by explosive eruptions (for example, [[lava bombs]] or blocks).
Lavas differ in chemical composition, but most forms of lava average 3000-4000 degrees [[Fahrenheit]]. Lavas are classified into the following categories based on their chemical composition: [[Basalt]] ([[Hawaii]]an [[volcano|volcanoes]]), [[Andesite]] ([[Andes]] Mountains), [[Dacite]] ([[Mt. St. Helens]]), or [[Rhyolite]] ([[Yellowstone National Park|Yellowstone]] [[caldera]]). Lava flow is classified into two types: [[pahoehoe]], which has low viscosity and moves quickly in roping patterns, and [[aa]], which moves slowly by crumbling over itself.
Lavas differ in chemical composition, but most forms of lava average 3000-4000 degrees [[Fahrenheit]]. Lavas are classified into the following categories based on their chemical composition: [[Basalt]] ([[Hawaii]]an [[volcano]]es), [[Andesite]] ([[Andes]] Mountains), [[Dacite]] ([[Mt. St. Helens]]), or [[Rhyolite]] ([[Yellowstone National Park|Yellowstone]] [[caldera]]). Lava flow is classified into two types: [[pahoehoe]], which has low viscosity and moves quickly in roping patterns, and [[aa]], which moves slowly by crumbling over itself.
A person can generally get as close as 1.5 metres to a lava flow before his clothes ignite.
A person can generally get as close as 1.5 metres to a lava flow before his clothes ignite.
[[category:Igneous Rocks]]
[[Category:Igneous Rocks]]