Metamorphic Rocks

Word Connections Metamorphic Meta - change Morph-change form Morphic- form

How are Metamorphic rocks formed? The deeper into Earth’s layers the greater the pressure and heat. Occurs deep beneath Earth’s surface Changed by extreme heat and pressure Don’t confuse with igneous Metamorphic rocks from much deeper inside the earth

http://www.youtube.com/watch?v=dYnZoX1zGBM

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 marble buildings statues slate flooring roofing walkways chalkboards http://www.brooklynslate.com/