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Earth Science Rocks! Warm up October 7

Earth Science Rocks! Warm up October 7. Cleopatra’s Needle in Central Park, New York City. This ancient obelisk has been in New York City for 125 years. . Egypt is threatening to take it back because of its condition. What things could have caused it to deteriorate? . Homework.

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Earth Science Rocks! Warm up October 7

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  1. Earth Science Rocks!Warm up October 7 Cleopatra’s Needle in Central Park, New York City. This ancient obelisk has been in New York City for 125 years. . Egypt is threatening to take it back because of its condition. What things could have caused it to deteriorate?

  2. Homework • Autobiography of a Rock worksheet • Write your name on the worksheet. • Put it away.

  3. Hurricane Rafael 35N, 61W

  4. Earth Science Rocks! • MYP Unit Question: How does land change? • Area of Interaction: Environment • Learner Profile: Caring and Principled

  5. Earth Science Rocks! Standard: Investigate the scientific view of how the Earth’s surface is formed. Learning Target: Today I am learning about weathering because I don’t want my bike to become soil.

  6. Weathering and Erosion

  7. Weatheringmeans the process of breaking down rocks and other substances at Earth’s surface.

  8. Erosion means the movement of rock particles by wind, water, ice, or gravity.

  9. Mechanical (Physical) Weathering is When rock is physically broken into smaller pieces (but still have the same chemical composition). Chemical weathering is Breaking down rocks through chemical changes. Two Types OF Weathering:

  10. There are 5 Types of Mechanical Weathering • Freezing and Thawing • Release of Pressure • Growth of Plants • Actions of Animals • Abrasion

  11. Freezing and thawing of water. (Ice Wedging)- Water seeps into cracks in rocks and then freezes when the temperature drops. It expands when it freezes and acts like a wedge.

  12. Release of pressure 1. Erosion carries away rocks from the top of a mountain. This reduces pressure on the rocks below and causes the outside rocks to crack and flake off like layers of an onion.

  13. Plant action- Plant roots grow in cracks of rocks and pry rocks apart.

  14. ActionsofAnimals • Animals burrow in the ground and break apart rocks.

  15. Abrasion- rubbing by other rocks. Sand and other rock particles carried by wind, water, ice, or gravity wear away rocks.

  16. Abrasion

  17. Types of Chemical Weathering • Water • Oxygen (Rust) • CO2 • Living Organisms • Acid Rain

  18. Water Minerals are dissolved in water. ex.: Halite, calcite

  19. Oxidation- Oxygen combines with water to make rust. (Oxidation) ex.: rusty bicycle

  20. CO2 • Carbon dioxide dissolves in rainwater to make carbonic acid (weathers marble and limestone).

  21. Living Organisms • Plant roots produce weak acids that dissolve rocks. Lichens grow on rocks and make weak acids.

  22. Acid Rain: Burning fossil fuels causes sulfur, carbon, and nitrogen to mix with water vapor in clouds to make acid rain.

  23. Rates of Weathering will depend on: Surface area exposed - More surface exposed, the faster the weathering will occur.

  24. A smashed piece has greatest surface area exposed. The interior can now be attacked. A full, solid block has the least surface area. The interior is safe from exposure.

  25. Rates of Weathering will depend on: • Type of Rock - some rocks and minerals are more resistant than others. • ex.:Quartz is resistant to chemical and physical weathering. Slate tombstones weather slower than marble tombstones.

  26. Rates of Weathering will depend on: • Climate: • Cold and/or dry climates favor physical weathering. • Warm and wet climates favor chemical weathering.

  27. Places to explore http://www.360cities.net/ Top of Kennesaw Mountain GA Philippine Rice Terraces Morocco sand dunes Grand Canyon Arizona Find a glacier

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