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Chapter 8 Weathering PowerPoint


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Chapter 8 Weathering PowerPoint

  1. 1. What happened to the Appalachian Mountains? Weathering and Erosion!Appalachian mountains today What scientists think the Appalachian mountains looked like 300 mya.
  2. 2. Weathering•Weathering – The breaking down of rockson Earth’s surface into sediments.•There are two types of weathering:
  3. 3. Mechanical Weathering1. Mechanical Weathering- Rocks willsometimes break down into smallerpieces but is still the same material.
  4. 4. Mechanical Weatheringa. Ice Wedging (Freeze-Thaw cycles) -Water has a unique property: it expandswhen it freezes! When water enters acrack in a rock and freezes, thenexpands and thaws over and over againit eventually breaks the rock up!
  5. 5. Mechanical Weatheringb. Abrasion - Wind, water, ice, andgravity carry rock and sand particlesthat grind away and break down rockslike sandpaper (or sandblasting).
  6. 6. Mechanical Weatheringc. Plants and Animals- Plant roots can grow into cracks and break open rocks. Burrowing animals move rock material to the surface making it easier to break down.
  7. 7. Chemical Weathering2. Chemical weathering- breaking down of rock by chemical reactions or changes.Examples of Chemical Weathering:a. Water - can dissolve and change rocks and minerals. (Feldspar can change to clay)
  8. 8. Chemical Weatheringb. Rust - Oxygen can combine with Iron in rocks which can make them appear red.c. Lichens - Organisms that live on rocks called Lichens can produce acids which wear away at rocks.
  9. 9. Chemical Weatheringd. Acid Rain-Pollution reacts with the water vapor in the clouds, producing acid rain.