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Chapt.4

Rocks

QuestionAnswer
rock a mixture of minerals, volcanic glass, organic matter, or other materials
rock cycle a model that shows how rocks change through time
igneous rock what magma forms when it cools and hardens
lava magma aboveground
intrusive rocks that form below the surface
extrusive rocks that form above the surface
basaltic dense dark colored igneous rocks
granitic light colored igneous rocks with lower density than basaltic
metamorphic rock rocks that have changed because of changes in temperature and pressure or the presence of hot watery fluids
foiliated when mineral grains flatten and line up parellel
non foiliated mineral grains dont form layers
sediment loose materials such as rock fragements, mineral grains and bits of shell moved by wind, water, ice, gravity
sedimentay rocks formed when sediments are pressed and cemented together
compactation when sediments are compacted together
cementation when sediments are cemented together
Created by: STEPHEN!
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