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chapter 5 voc

TermDefinition
lava lava is magma that flows out onto earth's surface
igneous rocks igneous rocks form when lava or magma cools and minerals crystallize
basaltic basaltic - least amount silica 42- 52% it is non explosive magma
andesitic andesitic - 52-66% andes mountains
rhyolitic rhyolitic - more than 66% violent eruptions yellowstone national park
temperature temperature generally increases with depth
pressure pressure also increases with depth as a result of the weight of the overlying rock
water content as water content increases the melting point decreases
mineral content rocks that are rich in iron and magnesium melt at higher temperatures than rocks that contain higher levels of silicon
basaltic rocks basaltic rocks - dark colored, low silica, contains plagiarize and pyroxene
granitic rocks granitic rocks - light colored, high silica, contains quartz and potassium
intermediate rocks intermediate rocks - falling between two groups - rocks that have composition between basaltic and granitic.
ultrabasic ultrabasic - only iron rich minerals such as olivine and pyroxene and they are the darkest rocks
intrusive rocks intrusive rocks cools and crystallizes below earth's surface
extrusive rocks extrusive rocks cools and crystallizes on earths surface
igneous rocks are classified by their mineral compositions
intrusive intrusive - has coarse grains (larger than 1cm)
extrusive extrusive - fine grains (needs magnifications to be seen)
porphyritic texture porphyritic texture - different sizes of grains
vesicular texture vesicular texture - spongy appearance
pegmatites pegmatites - are large veins
kimberlites kimberlites - produces diamonds
two places were kimberlites are found are arkansas and colorado
the rest of the worlds kimberlites are in africa
grains are crystals
igneous rocks have interlocking grains textures makes them durable.
Created by: katherinegraves
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