https://wikimd.org/index.php?action=history&feed=atom&title=MagmaMagma - Revision history2026-04-25T18:38:49ZRevision history for this page on the wikiMediaWiki 1.44.2https://wikimd.org/index.php?title=Magma&diff=6319595&oldid=prevPrab: CSV import2025-02-18T04:58:15Z<p>CSV import</p>
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<p><b>New page</b></p><div>'''Magma''' is a molten or semi-molten natural material from within the [[Earth's crust]] that forms [[igneous rock]] upon cooling. Magma is generated by the internal heat of the planet and is capable of intrusion into the crust, extrusion onto the surface as [[lava]], and explosive [[eruption]]s, to form [[volcano|volcanoes]].<br />
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== Formation ==<br />
Magma is produced when the Earth's mantle or crust melts. This can occur because of one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. The geothermal gradient, which is the difference in temperature between the core of the planet and its surface, drives a continuous conduction of thermal energy in the form of heat from the core to the surface.<br />
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== Types ==<br />
There are three major types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral composition. All three types of magma can be found at volcanoes and tectonic settings such as subduction zones and mid-ocean ridges.<br />
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== Behavior ==<br />
Magma behaves like a liquid and thus responds to pressure, temperature, and composition changes. The viscosity of magma is primarily determined by its temperature, composition, and crystal content.<br />
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== Role in the Earth's crust and mantle ==<br />
Magma plays a key role in the formation of the Earth's crust and mantle. The cooling of magma leads to the formation of igneous rock, which makes up a significant portion of the Earth's crust.<br />
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== See also ==<br />
* [[Lava]]<br />
* [[Volcano]]<br />
* [[Igneous rock]]<br />
* [[Earth's crust]]<br />
* [[Earth's mantle]]<br />
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[[Category:Geology]]<br />
[[Category:Volcanology]]<br />
[[Category:Igneous petrology]]<br />
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