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

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

  • Ch. 9 Lesson 1 How does Earth’s surface wear away?
    • natural features on Earth’s surface
    • mountains, plains, plateaus, peninsulas
    landforms
  • Along coasts, landforms such as peninsulas extend into the water.
  • weathering
    • process that breaks down rocks in Earth's crust
    • examples of weathering
  •  
  • mechanical (physical) chemical 2 types of weathering
    • physical weathering -
    • no change in chemical composition--just broken into smaller pieces
  • causes of physical weathering:
  • 1. water
  • 2. ice
  • 3. temp. changes
  • 4. plant roots
  •  
  • Physical Weathering 02:39
  • chemical weathering
    • rock broken into smaller pieces
    • material that makes up rock or soil changes
  • causes of chemical weathering:
    • 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.
    • Carbon dioxide (CO 2) dissolves in rain water & creates carbonic acid  acid rain
    • Carbonic acid easily weathers limestone & marble
  •  
    • chemicals from plants
    • lichens grow on rocks -make weak acids that chemically weather rock
    Rock meets lichen YouTube video
    • oxidation= iron combines w/ oxygen & H 2 0
    • makes rust
  • Oxidation turned these rocks in Nevada's Valley of Fire red.
  • Chemical Weathering [02:57]
  • 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