Rocks, Rocks, and More RocksMetamorphic Classified according to the arrangement of the grains that make up the rock & the minerals in them.
How do Metamorphic rocks form? From heat & pressure deep inside Earth
Metamorphic rocks can form from Igneous, Sedimentary, or other Metamorphic rocks as they are pushed down toward the heat of the mantle.
2 Types of Metamorphic Rock Foliated Nonfoliated “Banded” “Nonbanded”
Foliated Metamorphic Rock • Def: Grains arranged in layers or bands that split into layers • Examples: SlateSchistGneiss
Original Rock New Metamorphic Rock Heat & Pressure Shale Slate Shale (sedimentary) changes to Slate when heated & squeezed by pressure.
Original Rock New Metamorphic Rock Heat & Pressure Granite Gneiss Granite (Igneous) changes to Gneiss when heated & squeezed by pressure.
Nonfoliated Metamorphic Rock • Def: Mineral grains arranged randomly, do not split into layers • Examples: MarbleQuartzite
Original Rock New Metamorphic Rock Heat & Pressure Sandstone Quartzite When Sandstone (Sedimentary) is under extreme heat & pressure, Quartzite will form.
Uses of Metamorphic Rocks • Slate: • Marble: Old fashioned chalkboards, roofs, walkways, trim on buildings *Sculptures (most famous – Lincoln Memorial in Washington D.C.) * Buildings * Countertops & Flooring
THE ROCK CYCLE! • Use the online textbook – Active Art – to complete the rock cycle diagram • http://www.phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=cfp&wcsuffix=1056 • Let’s learn the Rock Cycle Song…
The Rock Cycle Song To the tune of Row, Row, Row Your Boat Sedimentary rock has been formed in layers Often found near water sources fossils and decayers Then there’s Igneous rock, here since Earth was born Magma, lava cooled and hardened that’s how it is formed These two kinds of rocks can also be transformed With pressure, heat, deep in Earth Metamorphic they’ll become