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gneiss is a/an _____
metamorphic rock
how are foliated and nonfoliated metamorphic rocks different
foliated has stripes
formation of large areas of metamorphic rock, usually in mountain areas
regional metamorphism
heat from magma alters surrounding rock
contact metamorphism
extreme temperatures and pressures and chemical changes affect the structure and composition of rock
metamorphism
chert is a ____ rock
sedimentary
sandstone is an example of ______ sedimentary rock
clastic
limestone made from the shells of dead organisms is ________ sedimentary rock
biochemical
formed when dissolved minerals crystallize (precipitate) directly from water
chemical sedimentary rock
sedimentary rock formed from pieces of broken rock
clastic
mafic rocks tend to be what color
darker colors
igneous rocks with high levels of silica are called
felsic
obsidian is a/an ______ igneous rock
extrusive
granite
igneous
pumice
igneous
igneous rocks that have large crystals because they cooled slowly
intrusive
fine grained igneous rocks that cooled quickly
extrusive
formed when heat/pressure alter rock composition and structure
metamorphic
formed from compaction and cementation of sediment
sedimentary
formed from cooling magma/lava
igneous