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Rocks
- 1. You need a calculator(NO PHONES) for my final exam!!
- 2.
- 3. What is aRock? • Mixture of minerals. Sometimes include organic matter.
- 4. Types of Rock? •3 types: • IGNEOUS • SEDIMENTARY • METAMORPHIC
- 5. Once a rockis formed, does it stay the same rock forever? • NO!
- 6. The Rock Cycle •Rocks changing from one type to one of the other 2 types.
- 9. • “Ignis” =Latin for “fire” • Formed from the cooling of either magma or lava • The most abundant type of rock
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- 11. • Formed fromsediments (rock fragments, mineral grains, animal & plant remains) that are pressed or cemented.
- 12. • These sedimentsare moved by wind, water, ice or gravity. • Sedimentary rocks cover 70% of the Earth’s surface! • Water can easily erode sedimentary rock • Sedimentary rocks are fossil-carrying rocks.
- 13. How can sedimentaryrocks help us understand the age of fossils? • As sedimentary rocks are made, they form layers • The layers on top (and the fossils in the top layer) are YOUNGER than the fossils in lower layers
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- 15. • Rocks thathave changed due to intense temperature and pressure • “Meta” means “change” and “morph” means “form” in Greek • Igneous, sedimentary and other metamorphic rocks can change to become metamorphic rocks
- 16. What occurs inthe Earth to change these rocks? • Pressure from overlying rock layers • High heat, but not enough to melt the rock
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- 19. Review of howthe 3 rock types are formed….
- 20. QUESTIONS 1. What arethe three types of rocks? 2. What type of rocks hold fossils? 3. What kind of rock has the Grand Canyon formed in (take your best guess)? 4. What kind of rock is made from lava? 5. What is the most common rock we see on the Earth’s surface? 6. Will an igneous rock stay an igneous rock forever?