2Metamorphic Rock from Greek: meta = “change”, morphosis = “form” heat and pressure deep beneath Earth’s surface can change any rock into metamorphic rock
3How Rocks ChangeCan change appearance, texture, crystal structure, and mineral contentCollisions between plates can push rock down toward mantle or pockets of magma can riseHigh temperatures change size and shape of grain and extreme pressure squeezes rock so tightly that the mineral grains may line up in flat, parallel layers
4Checkpoint 1What are two ways that rocks can be exposed to intense heat sufficient to turn them into metamorphic rocks?
5Checkpoint 1What are two ways that rocks can be exposed to intense heat sufficient to turn them into metamorphic rocks?They can be pushed down toward the mantle through plate tectonics or pockets of magma can rise.
6Types of Metamorphic Rocks Classified according to arrangement of grains that make up the rocksTypes:FoliatedNonfoliated
7Checkpoint 2How are metamorphic rocks classified?
8Checkpoint 2 How are metamorphic rocks classified? According to arrangement of grains
9Foliated Rocks Have their grains arranged in parallel layers or bands Folio is Latin for “leaf”May split apart along bandsE.g. slate (from shale), gneiss (from granite)
10Nonfoliated Rocks Mineral grains are arranged randomly Don’t split into layersE.g. quartzite (from sandstone)
12Checkpoint 3What is the difference between foliated and nonfoliated rocks?
13Checkpoint 3What is the difference between foliated and nonfoliated rocks?Foliated rocks are arranged in layers.
14Uses of Metamorphic Rock Certain metamorphic rocks are important materials for building and sculptureMarble (from limestone)Fine, even grain – can be cut into thin slabs or carved into many shapesEasy to polish – buildings and statuesSlateVariety of colorsSplits easily into flat pieces – flooring, roofing, outdoor walkways, chalkboards