Earth and Life Science SHS 6.2 Igneous Rocks.pptx

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1. Lesson 6.2 Igneous Rocks

2. describe the origin and environment of formation of igneous rocks. 1 At the end of the lesson, you should be able to: 2 identify and differentiate the types of igneous rocks; and

3. Igneous rocks are formed from solidification of magma or lava which flows out from depth. Minerals such as quartz, feldspar, pyroxene, olivine, amphibole, and mica are the components of almost all types of igneous rocks. Igneous Rocks Example of Igneous Rock Volcanic

4. Igneous rocks are characterized by intergrowth of crystals and/or volcanic glass. Crystal size is directly proportional to the cooling rate of magma. Formation of Igneous Rock

5. Big crystals are formed deep underground, while smaller crystals are formed near the surface. Formation of Igneous Rock Cooling and crystal formation

6. Bowen’s reaction series is a general model is created to show the progression of silicate crystallization at specific temperature.

7. An extrusive igneous rock forms when magma or volcanic fragments erupt and solidify on Earth’s surface which results to very fine-grained rock with very small crystals that could not be seen through naked eye. Types of Igneous Rocks Example of Extrusive Igneous Rock

8. An intrusive igneous rock forms when magma crystallizes within the crust and is composed of medium to coarse grains. It is also known as a plutonic rock. Types of Igneous Rocks Formation of Intrusive Igneous Rock

9. Igneous rocks can be named using the binary system which is mainly based on its texture and composition of the rock. Naming of Igneous Rocks Classifying igneous rocks based on texture and composition. Texture Composition (silica content) Felsic Intermediate Mafic extrusive (volcanic) rhyolite andesite basalt intrusive (plutonic) granite diorite gabbro

10. Igneous rock is formed from solidification of magma or lava which flows out from depth. 1 Igneous rocks can be classified based on the temperature-pressure condition. 2 3 Bowen’s reaction series shows the progression of silicate minerals crystallization at specific temperature condition.

11. Write the name of the igneous rock based on the description given. high silica content, coarse-grained texture low silica content, fine-grained texture high silica content, fine-grained texture equal amounts of dark and light colored minerals, fine-grained texture low silica content, coarse-grained texture

12. By just observing a rock sample, how would you know if it is an intrusive or extrusive rock?

13. Amethyst Galleries Inc. “Mineral Gallery” Accessed April 5, 2018. http://www.galleries.com/default.htm Coenraads, Robert R. 2005. Rocks & Fossils: A Visual Guide. Australia: Weldon Owen Inc. Tarbuck, Edward J. and Frederick J. Lutgens. 2012. Earth Science, 13th Edition. New Jersey: Pearson Prentice Hall. Thompson, Graham R. and Jonathan Turk. 1997. Introduction to Physical Geology. United States: Brooks Cole Publishing. Williams, Linda. 2004. Earth Science Demystified. United States: The McGraw -Hill Companies, Inc.