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from lava ex. basalt or igneous rock that forms from lava on earth's surface; cools faster, smaller crystals
from magma ex. granite or igneous rock that forms when magma hardens beneath earth's surface; cools slower, bigger crystals
slow cooling rocks
intrsuive rocks that have large crystals and thus has a chopped up texture ex. porphyry or pegmatite
fast cooling rocks
extrusive rocks that have small crystals and thus a fine grained or glassy texture ex. obsidian or basalt
varies as the composition of the magma and lava vary ex. lots of silica granite(light color) ex. low in silica (dark colored basalt)
the look and feel of a rock's surface, determined by the size, shape, and pattern of a rock's grains
a type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together
a type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions
the process by which dissolved minerals crystallize and glue particles of sediment together into one mass
term used to describe metamorphic rocks that have grains arranged in parallel layers or bands
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