Metamorphic Rock & The Rock Cycle Chapter in Prentice Hall Metamorphic Rock • Every metamorphic rock is a rock that has changed its form • “Metamorphic” means “changed form” Metamorphic Rock • Heat and pressure deep beneath Earth’s surface can change any rock into metamorphic rock • Sometimes, forces inside the Earth can push the rock down toward the heat of the mantle http://www.phschool.com/atschool/science_activity_library/images/earths_interior.jpg Metamorphic Rock Metamorphic Rock video Metamorphic Rock • When rock changes into metamorphic rock, its appearance, texture, crystal structure and mineral content change • Metamorphic rock can form out of igneous, sedimentary, or other metamorphic rock Metamorphic Rock • Geologists classify metamorphic rocks by the arrangement of the grains that make up the rocks – If grains are lined up in parallel layers or bands, they are said to be foliated Banded gneiss is foliated Banded gneiss photo from http://farm1.static.flickr.com/103/364932072_11c4f52462.jpg?v=0 Metamorphic Rock Slate Schist http://www.inspect-ny.com/roof/slate29.jpg Quartzite http://farm4.static.flickr.com/3140/2688358095_c968a7df0b.jpg?v=0 http://www.daviddarling.info/images/quartzite.jpg Metamorphic Rock Igneous or Sedimentary Granite Shale Sandstone Limestone Metamorphic Gneiss Slate Quartzite Marble The Rock Cycle • Forces inside Earth and at the surface produce a rock cycle that builds, destroys, and changes the rocks in the crust • The rock cycle is a series of processes on and beneath Earth’s surface that slowly changes rock from one form to another o of Prentice Hall Science Explorer: • The rock cycle can follow many different pathways, here is one example: • The intrusive igneous rock, granite could have formed under the Earth’s surface, then been pushed up forming a mountain The process of weathering by wind or water or other forces, then erosion and deposition could carry granite particles away and start the formation of sedimentary sandstone • After piling up many layers, the sandstone could be pushed deep into the Earth where heat and pressure turn it into the metamorphic rock, quartzite The quartzite, granite, or sandstone could be forced deeper into the Earth where it melts to move toward the Earth’s surface as magma then possibly lava I hope this slide didn’t give you a headache!! Rock Cycle Question • When the Earth first formed and was a new planet, what type of rock would you think was the first to form? IGNEOUS Rock review question • What is the most common coarse-grained igneous rock? Remember coarse-grained means it has large grains, and large grains are formed when igneous rock cools slowly below the Earth’s surface • Granite • What kind of texture will a conglomerate rock have? • Rounded [...]... heat and pressure turn it into the metamorphic rock, quartzite The quartzite, granite, or sandstone could be forced deeper into the Earth where it melts to move toward the Earth’s surface as magma then possibly lava I hope this slide didn’t give you a headache!! Rock Cycle Question • When the Earth first formed and was a new planet, what type of rock would you think was the first to form? IGNEOUS Rock. .. The rock cycle can follow many different pathways, here is one example: • The intrusive igneous rock, granite could have formed under the Earth’s surface, then been pushed up forming a mountain The process of weathering by wind or water or other forces, then erosion and deposition could carry granite particles away and start the formation of sedimentary sandstone • After piling up many layers, the sandstone... think was the first to form? IGNEOUS Rock review question • What is the most common coarse-grained igneous rock? Remember coarse-grained means it has large grains, and large grains are formed when igneous rock cools slowly below the Earth’s surface • Granite • What kind of texture will a conglomerate rock have? • Rounded