Chapter 5: Rocks Section 5: Metamorphic Rocks. Metamorphic Rock from Greek: meta = “change”,...
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Transcript of Chapter 5: Rocks Section 5: Metamorphic Rocks. Metamorphic Rock from Greek: meta = “change”,...
Chapter 5: RocksChapter 5: RocksSection 5: Metamorphic Rocks
Metamorphic RockMetamorphic Rockfrom Greek: meta = “change”, morphosis = “form”
heat and pressure deep beneath Earth’s surface can change any rock into metamorphic rock
How Rocks ChangeHow Rocks ChangeCan change appearance, texture,
crystal structure, and mineral contentCollisions between plates can push
rock down toward mantle or pockets of magma can rise
High 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
Checkpoint 1Checkpoint 1What are two ways that rocks
can be exposed to intense heat sufficient to turn them into metamorphic rocks?
Checkpoint 1Checkpoint 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.
Types of Metamorphic Types of Metamorphic RocksRocksClassified according to
arrangement of grains that make up the rocks
Types:◦Foliated◦Nonfoliated
Checkpoint 2Checkpoint 2How are metamorphic rocks
classified?
Checkpoint 2Checkpoint 2How are metamorphic rocks
classified?According to arrangement of
grains
Foliated RocksFoliated RocksHave their grains arranged in
parallel layers or bandsFolio is Latin for “leaf”May split apart along bandsE.g. slate (from shale), gneiss
(from granite)
Nonfoliated RocksNonfoliated RocksMineral grains are arranged
randomlyDon’t split into layersE.g. quartzite (from sandstone)
Nonfoliated vs. Foliated Nonfoliated vs. Foliated RocksRocks
Checkpoint 3Checkpoint 3What is the difference between
foliated and nonfoliated rocks?
Checkpoint 3Checkpoint 3What is the difference between
foliated and nonfoliated rocks?Foliated rocks are arranged in
layers.
Uses of Metamorphic RockUses of Metamorphic RockCertain metamorphic rocks are
important materials for building and sculpture◦Marble (from limestone)
Fine, even grain – can be cut into thin slabs or carved into many shapes
Easy to polish – buildings and statues◦Slate
Variety of colors Splits easily into flat pieces – flooring,
roofing, outdoor walkways, chalkboards
Checkpoint 4Checkpoint 4Why are metamorphic rocks
useful?
Checkpoint 4Checkpoint 4Why are metamorphic rocks
useful?Marble: fine, even grain; can be
cut into thin slabs or carved; easy to polish
Slate: splits evenly into flat pieces
Post-lesson QuizPost-lesson Quiz
1. How are metamorphic rocks classified?
a. by the arrangement of their grain
b. by the color of their grainc. by the size of their graind. by the texture of their grain
Post-lesson QuizPost-lesson Quiz
2. What can change about a rock when it becomes metamorphic?
a. textureb. crystal structurec. mineral contentd. all of the above
Post-lesson QuizPost-lesson Quiz
3. What two things do metamorphic rocks need to form?
a. electricity and airb. heat and pressurec. heat and waterd. pressure and water
Post-lesson QuizPost-lesson Quiz
4. What is the heat source for transforming metamorphic rocks?
a. lavab. the Sunc. magmad. thermal vents
Post-lesson QuizPost-lesson Quiz
5. Which of the following is not a metamorphic rock?
a. slateb. limestonec. marble d. gneiss