ERTH 20 Lecture Notes - Lecture 17: Metamorphic Rock, Igneous Rock, Clastic Rock
2 Dec 2020
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Document Summary
Aggregate of one or more minerals; some organic material rocks; some inorganic. Rocks are lumped into 3 groups by how they form- know the 3 groups and how they form material rocks. Lithification from sediment can be crystalline or clastic rock. The rock cycle: formed from freezing molten magma. Igneous rock- melting to form magma, solidification; melting. You can turn further metamoprh a metamorphic rock. You can further sediment and sedimentary rock. You can further ignate an igneous rock. Volcano- vent where molten rock comes out of earth. Igneous rock is formed by cooling from a melt. Lava- magma that flows on the earth"s surface. Igneous rock freezes at high temperatures (t) Magma is a tiny percentage of crust or mantle. The rest of the mantle and crust is solid. What makes a rock melt: drop the pressure, add water, add heat. Liquids are less dense than solids and gas is less dense than liquid.
