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Basalt displays both pahoehoe and aa texture in one place. ... Both of these basalt flows have the same composition, but while they were molten, the smooth pahoehoe lava was hotter than the jagged aa lava. (more below)
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geology.about.com/od/more_igrocks/ig/basalt/aapahoehoe....
geology.about.com/od/more_igrocks/ig/basalt/aapahoehoe.htm
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Block-lavas are often emerged in a fairly viscous state. They tend to be both stronger and thicker than aa lava flows. The more silicic the magma, the shorter and stubbier is the flow. Block lavas move slowly at a rate ranging from 1 to 5 meter a day.
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library.thinkquest.org/17457/volcanoes/hazards.lavaflow...
library.thinkquest.org/17457/volcanoes/hazards.lavaflow.php
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Photos/ pictures of a'a' lava, brief explanation ... A'a' lava forms when the viscosity of the lava (e.g. because of high gas bubbles content and relatively low temperatures) and/or the strain rate of the flow (related mainly to eruption rate and steepness of the ground) are high.
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www.decadevolcano.net/photos/keywords/a_a_lava.htm
www.decadevolcano.net/photos/keywords/a_a_lava.htm
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Aa lava is solidified and clinkery. The surface is sharp and broken into many pieces. Walking over aa lava surface can be dangerous because it is like broken glass.
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www.volcanolive.com/aa.html
www.volcanolive.com/aa.html
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A'a Lava | Universe Today ... If you've ever been to the Big Island of Hawaii and gone for a hike, you've seen a'a lava. It's incredibly rough and jagged black rock that takes forever to walk across; and tears your shoes apart as you go. ... Tags: aa, Earth science, eruptions, lava, volcano, volcanoes...
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www.universetoday.com/guide-to-space/earth/aa-lava/
www.universetoday.com/guide-to-space/earth/aa-lava/
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Research Aa Type of Lava and other related topics by using the free encyclopedia at the Questia.com online library. ... ...across this type of lava! Aa flows are...flows. Another type of flow, with...pahoehoe and aa, has been...toothpaste lava." Lava flows...similar to aa but lack spiny...projections. Block lava flows...
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www.questia.com/library/encyclopedia/aa-type-of-lava.js...
www.questia.com/library/encyclopedia/aa-type-of-lava.jsp
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AA lava is a dense lava, with lots of breccias and rocks all through it. Due to its chunky flow, when it cools, it has the appearance of a mass collection of rocks, strewn about randomly and melted together, making it an unpleasant surface to walk on.
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www.albion.edu/geology/Geo210_Hawaii/MaunaLoa/aa_lava.h...
www.albion.edu/geology/Geo210_Hawaii/MaunaLoa/aa_lava.htm
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While chemically like pahoehoe, aa lava is not smooth and billowy but is rough, jagged, and spiny. It appears to owe its origin to a different combination of gas and heat. ... It is the escaping gas from the doughy mass which pulls out stringers of lava and causes the spines on the aa lava. It is usually difficult for...
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www.cr.nps.gov/history/online_books/geology/publication...
www.cr.nps.gov/history/online_books/geology/publications/id/ui-1928-13/sec5.htm
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‘A‘a is lava that has a rough surface and irregularly shaped vesicles or holes. ... Back to Volcanic Rocks...
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www.kamalii.k12.hi.us/Volcanoes%20Main%20Topic/aa_lava_...
www.kamalii.k12.hi.us/Volcanoes%20Main%20Topic/aa_lava_rock.htm
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