AIM: How are metamorphic rocks formed, classified and used? OBJ: Given notes and activity sheet SWBAT explain how metamorphic rocks are formed, classified.

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Presentation transcript:

AIM: How are metamorphic rocks formed, classified and used? OBJ: Given notes and activity sheet SWBAT explain how metamorphic rocks are formed, classified and used with 70% accuracy DN: HW Check- WEDS Activity Sheet (distribute Answer Key); Watch video ACT: Introduction to Metamorphic Rocks (Notes) Text, read p ; Complete Metamorphic Rocks Activity Sheet HW: Complete Metamorphic Rocks Activity Sheet; Minerals & Rocks Exam, March 20.

Metamorphic Rocks Metamorphic = change form; heat & pressure deep beneath Earth’s surface can change any rock into a metamorphic rock. Metamorphism occurs: 1) At the site of plate collision (subduction) 2) Within the core of mountains 3) Near rising magma plumes.

Types of Metamorphic Rocks High Temperature: changes the size & shape of the grains or mineral crystals (= recrystallization). Extreme Pressure: squeezes rock so tightly that mineral grains /crystals line up in flat, parallel layers.

Metamorphic Rocks Metamorphic Rocks are classified based on the arrangement of the grains (crystals): Foliated Rocks: the crystals are arranged in parallel layers or bands. Nonfoliated Rocks: the mineral grains are arranged randomly and grain (crystal) size has increased (= recrystallization). These rocks are extremely hard.

original rock → metamorphic rock shale → slate granite → gneiss sandstone → quartzite limestone→ marble

Granite Metamorphism Gneiss Limestone Metamorphism Marble

Shale Metamorphism Slate Limestone Metamorphism Marble

High Grade

Metamorphic Settings

Uses of Metamorphic Rock Building: slate flooring, walkways, chalkboard, marble Sculpture: marble Lincoln Memorial