Metamorphic Rocks Word Connections Metamorphic Meta change Morphchange
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Metamorphic Rocks
Word Connections • Metamorphic • Meta - change • Morph-change form • Morphic- form
How are Metamorphic rocks formed? Changed by extreme heat and pressure Occurs deep beneath Earth’s surface The deeper into Earth’s layers the greater the pressure and heat. Don’t confuse with igneous Metamorphic rocks from much deeper inside the earth
• http: //www. youtube. com/watch? v=d. Yn. Zo. X 1 z GBM
Connection to Plate Tectonics • Earth’s plates collide and push rock down toward the heat of the mantle. – (subduction of two oceanic plates)
(extreme) High temperatures change the size and shape of the rock grains.
Pressure!!!! Before metamorphism After metamorphism • Pressure causes grains to line up in flat/ parallel layers
Rock grains changing due to pressure
Different types of grains under fluorescence
Rock grains changed after metamorphism
Folliated=parallel • folliated- grains arranged in parallel layers
All three types of rock can become a metamorphic rock • Igneous-metamorphic • Sedimentary-metamorphic • Metamorphic-metamorphic
How are they classified • By the way the grains are arranged
What happens ? • Total change – Appearance – Texture – Crystal structure – Mineral content
Types of Metamorphic Rock • Shale turns into slate. • Sandstone turns into quartzite • Granite turns into gneiss
Metamorphic Banding Caused by extreme pressure!!!
Uses/Real world Connections http: //www. brooklynslate. com/ marble buildings statues slate flooring roofing walkways chalkboards