5Metamorphic RockWhen rock changes into metamorphic rock, its appearance, texture, crystal structure and mineral content changeMetamorphic rock can form out of igneous, sedimentary, or other metamorphic rock.
6Metamorphic RockGeologists 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 gneissis foliatedBanded gneiss photo from
7Metamorphic Rock Slate Schist Quartzite Quartzite
8Metamorphic Rock Igneous or Metamorphic Sedimentary Granite Gneiss Shale SlateSandstone QuartziteLimestone Marble
9The Rock CycleForces inside Earth and at the surface produce a rock cycle that builds, destroys, and changes the rocks in the crustThe rock cycle is a series of processes on and beneath Earth’s surface that slowly changes rock from one form to another.
10Photo of Prentice Hall Science Explorer: Earth Science Rock Cycle diagram page 95.
11The 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!!
12Rock Cycle Question IGNEOUS When the Earth first formed and was a new planet, what type of rock would you think was the first to form?IGNEOUS
13Rock review question Granite Rounded 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.GraniteWhat kind of texture will a conglomerate rock have?Rounded