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8th- Igneous Rocks

TermDefinition
igneous rocks rocks that form from the cooling of magma or lava
extrusive rocks igneous rocks that form from lava cooling above the earth's surface
intrusive rocks igneous rocks that form from magma cooling below earth's surface
porphyritic rocks igneous rocks that form from slowly cooled magma at first, then quickly as it rises toward the surface
felsic rocks that contain a lot of silicate minerals, so they are light-colored (except obsidian)
mafic rocks that contain a lower content of silicate minerals and more iron and magnesium, so they are dark-colored
fine-grained texture of an igneous rock where the crystals are so small, you need a magnifying glass to see them
coarse-grained texture of an igneous rock where the crystals are large enough to see with the naked eye and are all the same size
porphyritic texture texture of an igneous rock that has coarse, or large, grains on a fine-grained background
glassy texture texture of an igneous rock that is smooth and absolutely no crystals form
porous texture texture of an igneous rock that has holes formed from volcanic gases passing through during formation
Created by: holtzmanscience
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