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Section 12.1 WEATHERING

Section 12.1 WEATHERING. WEATHERING. TWO TYPES: ·Physical Weathering: ·Chemical Weathering:. rocks are broken down without a chemical reaction. chemical reaction occurs changing the composition of the rock. Mechanical Weathering. Ice and water

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Section 12.1 WEATHERING

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  1. Section 12.1 WEATHERING

  2. WEATHERING TWO TYPES: ·Physical Weathering: ·Chemical Weathering: rocks are broken down without a chemical reaction. chemical reaction occurs changing the compositionof the rock

  3. Mechanical Weathering • Ice and water • frost wedging – water seeps into cracks in rock • expands when it freezes causing the crack to expand

  4. Checkpoint #1 Which type of climate has the greatest amount of rock weathering caused by frost wedging? 1 a dry climate in which temperatures remain below freezing 2 a dry climate in which temperatures alternate from below freezing to above freezing 3 a wet climate in which temperatures remain below freezing 4 a wet climate in which temperatures alternate from below freezing to above freezing

  5. Mechanical Weathering • Abrasion • Striking rock with sand, pebbles, and large rocks

  6. Examples of Abrasion 1. Ice: Glacial

  7. 2. Gravity: Mass Movement

  8. 3. Water: River, Ocean, Lake action

  9. 4. Wind

  10. Checkpoint #2 The picture (see image) shows a geological feature in the Kalahari Desert of southwestern Africa. Which process most likely produced the present appearance of this feature? 1 Wind Erosion 3 Earthquake Vibrations Volcanic Eruption 2 4 Plate Tectonics

  11. Mechanical Weathering • Plants and animals • The breakdown of rock due to plant and animal activity

  12. Mechanical Weathering • Upward expansion • Rock outcrops lift, exposing them to weathering

  13. Checkpoint #3 The diagram shows the stump of a tree whose root grew into a small crack in bedrock and split the rock apart. The action of the root splitting the bedrock is an example of 1 Chemical Weathering 3 Erosion 2 Deposition 4 Mechanical Weathering

  14. Mechanical Weathering http://www.classzone.com/books/earth_science/terc/content/visualizations/es1201/es1201page01.cfm

  15. Chemical Weathering • Hydrolysis • Reaction of water with other substances

  16. Chemical Weathering • Oxidation • oxygen reacts with rock, breaking them down • produces rust

  17. Think-Pair-Share Think: After thousands of years Cleopatra's Needle looked like the picture on the left. After 100 years in NYC it looks like the picture on the right. Why do you believe this happened? Pair: Discuss this with someone near you Share: Be ready to be called on to share your answers

  18. http://www.classzone.com/books/earth_science/terc/content/visualizations/es1202/es1202page01.cfmhttp://www.classzone.com/books/earth_science/terc/content/visualizations/es1202/es1202page01.cfm

  19. Rates of Weathering • Surface Exposure • More surface area more weathering • Composition of rock • Some rocks weather better than others • Climate • Some climates are more conducive to weathering

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