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8th Grade Science

Igneous Rocks

rock cycle series of process in which rocks forms, changes from one type to another, is broken down or melted, and forms again by geologic process
igneous hot rocks/fire rocks
igneous rock defined by where they are formed: (Extrusive and Intrusive) and what they are made of:(Basaltic, Granitic, Andesitic)
Magma molten rock below the Earth's surface
lava molten rock above the Earth's surface
Intrusive Igneous Rock rocks formed from magma that cool slow and have large crystals Examples: Gabbro, Diorite, Granite
Extrusive Igneous Rock rocks formed from magma that cool fast and have small crystals Examples: Pumice, Obsidian, Basalt
basaltic an igneous rock that is high in Fe and Mg and low in SiO2 that is dark colored and high density. Found on the ocean floor and Hawaii
Granitic An Igneous rock that is high in SiO2 and low Fe and Mg that is light colored, low density, and found on the continents
Andesitic An igneous rock that is high in Fe and Mg, low in SiO2, that is grey colored, medium density, and found at the Pacific Rim
SiO Silicon Oxide
Fe Iron
Mg Magnesium
Created by: SSC 8th LA