4th Grade-Ch. 9 Lesson 1 How does earth's surface wear away

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  • 1. Ch. 9 Lesson 1 How does Earth’s surface wear away?
  • 2.
    • natural features on Earth’s surface
    • mountains, plains, plateaus, peninsulas
    landforms
  • 3. Along coasts, landforms such as peninsulas extend into the water.
  • 4. weathering
    • process that breaks down rocks in Earth's crust
  • 5.
    • examples of weathering
  • 6.  
  • 7. mechanical (physical) chemical 2 types of weathering
  • 8.
    • physical weathering -
    • no change in chemical composition--just broken into smaller pieces
  • 9. causes of physical weathering:
  • 10. 1. water
  • 11. 2. ice
  • 12. 3. temp. changes
  • 13. 4. plant roots
  • 14.  
  • 15. Physical Weathering 02:39
  • 16. chemical weathering
    • rock broken into smaller pieces
    • material that makes up rock or soil changes
  • 17. causes of chemical weathering:
  • 18.
    • acids in rainwater
    This photograph shows a small section of masonry from a church in northern France. The rock was originally a smooth pillar like structure forming part of the outside decoration of the building. Over the last hundred years or so, acidic rain water has constantly dripped onto the rock from a rain gutter several meters above it.
  • 19.
    • Carbon dioxide (CO 2) dissolves in rain water & creates carbonic acid  acid rain
    • Carbonic acid easily weathers limestone & marble
  • 20.  
  • 21.
    • chemicals from plants
    • lichens grow on rocks -make weak acids that chemically weather rock
    Rock meets lichen YouTube video
  • 22.
    • oxidation= iron combines w/ oxygen & H 2 0
    • makes rust
  • 23. Oxidation turned these rocks in Nevada's Valley of Fire red.
  • 24. Chemical Weathering [02:57]
  • 25. Weathering Walk
    • Find 3 places where weathering has occurred
    chemical Rusty AC chemical Rust Bench Physical Incline Trench in pit Physical Tree roots-cracking sidewalk Tree-sidewalk sidewalk physical or chemical appearance location