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Often volcanic lava was poured into water lakes or oceans, and from this contact has suffered a rapid cooling process, which led to the rocks results of a glassy texture. Obsidian is amorphous and translucent. ... Tektites form is special, being irregular, presenting various lumps and bulbs of glassy substance.
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www.enotes.com/science/q-and-a/how-do-igneous-rocks-wih...
www.enotes.com/science/q-and-a/how-do-igneous-rocks-wiht-glassy-textures-form-116935
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Igneous rocks form when molten lava (magma) cools and turn to solid rock. The magma comes from the Earth’s core which is molten rock . The core makes up about 30% of the Total Earth Mass (31.5%) ... Obsidian is nature’s glass. It forms when lava cools quickly on the surface. It is glassy and smooth.
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www.rocksforkids.com/RFK/howrocks.html
www.rocksforkids.com/RFK/howrocks.html
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Rocks form in three main ways: igneous - by crystallization of minerals from molten material or magma as it cools sedimentary - by accumulation of materials which have been eroded and weathered from pre-existing rocks at the earth's surface metamorphic - by modification of pre-existing rocks by heat, pressure or the...
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www.em.gov.bc.ca/Mining/Geolsurv/Publications/InfoCirc/...
www.em.gov.bc.ca/Mining/Geolsurv/Publications/InfoCirc/IC1987-05/rockform.htm
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How Rocks Form - Igneous Rocks ... 3. Distinguish between intrusive and extrusive igneous rocks and how they form. ... 4. Contrast the types of plutons that form as the result of igneous activity.
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www.csun.edu/~psk17793/ES9CP/ES9%20how_rocks_form.htm
www.csun.edu/~psk17793/ES9CP/ES9%20how_rocks_form.htm
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Obsidian is one of the major igneous rock types. ... Obsidian is an extrusive rock: lava that cooled without forming crystals, giving it a glassy texture. Learn more about obsidian in the obsidian picture gallery. ... About Igneous Rocks...
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geology.about.com/od/rocks/ig/igrockindex/rocpicobsidia...
geology.about.com/od/rocks/ig/igrockindex/rocpicobsidian.htm
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For The Igneous Rock Obsidian, What Does The Glassy Texture Indicate About Its Formation? ... How Do Igneous Rocks Form? ... How Do Sedimentary Rocks Form?
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www.blurtit.com/q373477.html
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How do igneous rocks form? ... Igneous rocks are crystalline or glassy rocks formed by the cooling and solidification of molten magma. ... Obsidian rocks are igneous rocks that form when lava cools quickly above ground. Obsidian is actually glass and not a mixture of minerals. The edges of this rock are very sharp.
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w4.nkcsd.k12.mo.us/~amerenbl/igneous_rocks.html
w4.nkcsd.k12.mo.us/~amerenbl/igneous_rocks.html
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If melted rock cools instantly, allowing no time at all for the atoms to form orderly patterns, the rock texture is glassy. ... ; How Do Igneous Rocks Form?
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www.classzone.com/books/earth_science/terc/content/inve...
www.classzone.com/books/earth_science/terc/content/investigations/es0603/es0603page05.cfm
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Igneous rocks are crystalline or glassy rocks formed by the cooling and solidification of molten magma. Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary.
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geology.csupomona.edu/alert/igneous/ignrxs.htm
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