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HNRS 227 Lecture #18 Chapter 19

HNRS 227 Lecture #18 Chapter 19. The Earth presented by Prof. Geller 29 October 2002. Key Points of Chapter 19. Minerals Rocks Igneous, Sedimentary, Metamorphic The Rock Cycle Earth’s Interior Crust, Mantle, Outer Core, Inner Core Plate Tectonics. Telling Rocks Apart.

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HNRS 227 Lecture #18 Chapter 19

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  1. HNRS 227 Lecture #18Chapter 19 The Earth presented by Prof. Geller 29 October 2002

  2. Key Points of Chapter 19 • Minerals • Rocks • Igneous, Sedimentary, Metamorphic • The Rock Cycle • Earth’s Interior • Crust, Mantle, Outer Core, Inner Core • Plate Tectonics

  3. Telling Rocks Apart • How geologists tell apart different minerals and rocks • color, luster, texture • hardness test • scratching one against another • diamond is hardest • acid test • using weak hydrochloric acid to • streak test • form a streak across a ceramic tile

  4. Minerals(see Table 19.1) • Characteristics • naturally occurring • inorganic • definite crystalline structure • The natural resources of industry

  5. Igneous Rocks • “Rocks formed from hot molten mass of melted rock material” • See Figure 19.11 in textbook

  6. Sedimentary Rocks • “Rocks formed from particles or dissolved materials from previously existing rocks.” • See Table 19.2 in textbook

  7. Metamorphic Rocks • “Previously existing rocks that have been changed by heat, pressure, or hot solutions into a distinctly different rock.” • See Figure 19.13 in textbook

  8. The Rock Cycle

  9. Earth’s Interior andHow We Know It

  10. Earthquakes Galore

  11. Earth’s Inside Story

  12. Crustal Rumblings

  13. Plate Tectonics • “The theory that the Earth’s crust is made of rigid plates that float on the asthenosphere.” • Consider the scientific evidence for plate tectonics and what forced scientists to accept the theory as fact

  14. Fossils across an ocean

  15. Boundaries Galore

  16. Plates are smashing

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