Presentation on theme: "Chapter 5: Rocks Section 5: Metamorphic Rocks. Metamorphic Rock from Greek: meta = “change”, morphosis = “form” heat and pressure deep beneath Earth’s."— Presentation transcript:
Chapter 5: Rocks Section 5: Metamorphic Rocks
Metamorphic Rock from Greek: meta = “change”, morphosis = “form” heat and pressure deep beneath Earth’s surface can change any rock into metamorphic rock
How Rocks Change Can change appearance, texture, crystal structure, and mineral content Collisions 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 1 What are two ways that rocks can be exposed to intense heat sufficient to turn them into metamorphic rocks?
Checkpoint 1 What 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 Rocks Classified according to arrangement of grains that make up the rocks Types: ◦ Foliated ◦ Nonfoliated
Checkpoint 2 How are metamorphic rocks classified?
Checkpoint 2 How are metamorphic rocks classified? According to arrangement of grains
Foliated Rocks Have their grains arranged in parallel layers or bands Folio is Latin for “leaf” May split apart along bands E.g. slate (from shale), gneiss (from granite)
Nonfoliated Rocks Mineral grains are arranged randomly Don’t split into layers E.g. quartzite (from sandstone)
Nonfoliated vs. Foliated Rocks
Checkpoint 3 What is the difference between foliated and nonfoliated rocks?
Checkpoint 3 What is the difference between foliated and nonfoliated rocks? Foliated rocks are arranged in layers.
Uses of Metamorphic Rock Certain 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 4 Why are metamorphic rocks useful?
Checkpoint 4 Why 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 Quiz 1. How are metamorphic rocks classified? a. by the arrangement of their grain b. by the color of their grain c. by the size of their grain d. by the texture of their grain
Post-lesson Quiz 2. What can change about a rock when it becomes metamorphic? a. texture b. crystal structure c. mineral content d. all of the above
Post-lesson Quiz 3. What two things do metamorphic rocks need to form? a. electricity and air b. heat and pressure c. heat and water d. pressure and water
Post-lesson Quiz 4. What is the heat source for transforming metamorphic rocks? a. lava b. the Sun c. magma d. thermal vents
Post-lesson Quiz 5. Which of the following is not a metamorphic rock? a. slate b. limestone c. marble d. gneiss