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Earth Science Chapter 8: Rocks Lesson 4: Metamorphic Rocks • Learning Targets • By the end of the lesson, I will be able to: 1. Explain how metamorphic rocks form 2. Identify samples of foliated and non foliated metamorphic rocks • Pg 192 Textbook How metamorphic rocks form • Deep in the earth, heat and pressure from all sides squeeze, bend and twist rock • Heat and pressure change the appearance and texture of rock • Can also form when liquids and gases escape from magma Foliated rocks • Foliated rocks form when heat and pressure have flatted the minerals into bands • Slate, schist, and gneiss are examples • Slate has very thin bands and contains mica • Lots of cleavage so many cracks (good for tile) Non foliated rocks • Rocks that are made largely of only one material, such as limestone and sandstone, result in metamorphic rocks without bands, called non foliated rocks • Much harder • Marble is formed from limestone (small amounts of mineral form colors) Recap • Learning Targets • By the end of the lesson, I will be able to: 1. Explain how metamorphic rocks form 2. Identify samples of foliated and no foliated metamorphic rocks • Assignment