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Perlite—A lightweight volcanic rock of great usefulness. ... Greenschist—Rock made by low-grade metamorphism of various rock types. Greenstone—A dark rock made by metamorphism of basalt. Hornfels—Tough and fine-grained, it forms where igneous rocks cook it. Marble—The metamorphic version of limestone.
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geology.about.com/library/bl/images/blrockindex.htm
geology.about.com/library/bl/images/blrockindex.htm
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Dikes occur in many different structural positions. Lava intruding along ... The deposits may occur in the volcanic rocks themselves, or the rocks the are extruded onto. The extrusions can be in any form of extruded volcanic rock, and also as shallow intrusions of various types (dikes, sills, pipes), or pyroclastic rocks.
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www.dmtcalaska.org/course_dev/explogeo/class06/notes06....
www.dmtcalaska.org/course_dev/explogeo/class06/notes06.html
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There are many different types of volcanic and plutonic igneous rocks. However, they all have in common that they were once molten, and have since ... Igneous rocks look different because of two factors: (1) they have cooled at different rates and (2) the "Mother" Magma (original melted rock) was a different composition.
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www.msnucleus.org/membership/html/k-6/pt/volcanoes/3/pt...
www.msnucleus.org/membership/html/k-6/pt/volcanoes/3/ptv3_1a.html
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Now you decide to go look around some more, and you find an exhibit on different types of lava and different types of eruptions. It says that there is one type of eruption that ... Another type of eruption is when there is thicker magma. The gas pressure breaks up the rock into different pieces. ... To Volcanic Products...
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library.thinkquest.org/J001393/volcanoes/lava.htm
library.thinkquest.org/J001393/volcanoes/lava.htm
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partial melting of continental rock for rhyolites. ... What is determining these two different types of volcanic constructs? Melt viscosity and gas content!
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maps.unomaha.edu/Maher/geo101/part2/volcans.html
maps.unomaha.edu/Maher/geo101/part2/volcans.html
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Borehole Image Data- Identification of Volcanic Rock Types; Sarah L. Haggas, Department of Geology, University of Leicester; ODP uses many new technologies to increase the quality of the core data. Different volcanic lithologies can be identified on the FMS image data by variations in electrical conductivity.
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www.odplegacy.org/PDF/Outreach/Brochures/Greatest_Hits2...
www.odplegacy.org/PDF/Outreach/Brochures/Greatest_Hits2/haggasborehole.pdf
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"Quick Reference Guide" - Various Volcano Types; -- Caldera ... Cinder Cone and Scoria Cone ... Composite Volcano or Stratovolcano ... Continental Volcanoes ... Island Arc Volcanoes ... Lava Plateau ... Lava Dome ... ... Volcanic Fields - Menu...
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vulcan.wr.usgs.gov/Glossary/VolcanoTypes/framework.html
vulcan.wr.usgs.gov/Glossary/VolcanoTypes/framework.html
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We could say a volcano is a liquid rock plumbing system which extends from several 10's of kilometers depth to the earth's surface, ... What types of volcanic hazards might they face? These questions are difficult to answer because there are many types of volcanic eruptions which produce different types of volcanic hazards.
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www.geo.mtu.edu/volcanoes/
www.geo.mtu.edu/volcanoes/
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What types of volcanic hazards might they face? These questions are difficult to answer because there are many types of volcanic eruptions which produce different types of volcanic hazards. ... They produce fragmental rocks from erupting lava and surrounding country rock. Some eruptions are highly explosive and produce...
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www.geo.mtu.edu/volcanoes/hazards/primer/
www.geo.mtu.edu/volcanoes/hazards/primer/
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