Topic: Pillow Basalt
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How does pillow basalt form?
Pillow basalt is formed when lava extrudes from the ocean floor - perhaps into a sediment overburden (?) - such that each bolus of lava is separate from the others. Read More »
Source: http://wiki.answers.com/Q/How_does_pillow_basalt_form
Where does pillow basalt form?
Pillow basalt is a volcanic igneous rock that forms when lava of basaltic compositionis erupted underwater. The rapid cooling of the lava by cold water on all sides forms the pillow-shaped bodies, which can then break open and extrude more ... Read More »
Source: http://www.nps.gov/goga/forteachers/pillow-basalt-faq.htm
Why are crystals in pillow basalt smaller then ones in basalt?
A factor that determines crystal size in igneous rocks is the speed in which the lava/ magma crystallised or froze. As pillow basalts form at mid ocean ridges where magma is erupted into direct contact with the cold sea water the crystals f... Read More »
Source: http://wiki.answers.com/Q/Why_are_crystals_in_pillow_basalt_small...
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Pillow Basalt
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Answers to Other Common Questions
Pillow basalt is a volcanic igneous rock that forms when lava of basaltic compositionis erupted...
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Source: http://www.chacha.com/question/how-is-pillow-basalt-is-only-forme...
Eruption was taking place under water or close to water.
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Source: http://wiki.answers.com/Q/What_do_pillow_basalts_indicate_about_t...
Pillow basalts form when lava is extruded into water. They compr...
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Source: http://www.chacha.com/question/what-does-pillow-basalts-and-uplif...
A very, very small percentage. Since it only occurs when lava erupts underwater, there are not a large number of places where this can occur. Most of those places are near the surface so tidal, and wave action quickly erodes these features.
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Source: http://answers.yahoo.com/question/index?qid=20071008204009AAAjfUk
The only ones I know of are pillows and peperites. http://en.wikipedia.org/wiki/Pillow_lava http://en.wikipedia.org/wiki/Peperite
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Source: http://answers.yahoo.com/question/index?qid=20091108191931AAU8nEt
