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8th- Igneous Rocks
| Term | Definition |
|---|---|
| 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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