external processes erosion weathering. table of contents datetitlelesson # 8/275 themes of...
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External Processes
Erosion Weathering
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Table of ContentsDate Title Lesson #
8/27 5 Themes of Geography 2
8/28 The 5 A’s 3
8/31 Geographer’s Tools 4
9/1 Internal Forces 5
9/3 External Forces 6
1. Draw a line underneath wherever you left off yesterday.
2. Write the title “External Forces”
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• Weathering - forces that are changing rocks, land, and objects over time, even day to day.
• 2 types: Mechanical Weathering and Chemical Weathering
COPY WHAT’S IN THE BOX
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Mechanical weathering – a force breaks a rock into smaller pieces by forcing them apart.
- Example: Breaking large rocks into smaller ones
COPY WHAT’S IN THE BOX
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Causes of Mechanical Weathering
1. Root wedging – roots break up rocks
2. Frost Wedging - ice get into rocks
3. Thermal expansion – heat causes rocks to expand and break
COPY WHAT’S IN THE BOX
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Effects of Mechanical Weathering
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Conclusion
• How is mechanical weathering like a hammer?
• Directions: Copy the sentence above and write one complete sentence responding to it in your notebook.
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Chemical Weathering
• Chemical weathering - when something "eats away" at a rock instead of breaking it apart.
• Requires a chemical change in the rocks
COPY WHAT’S IN THE BOX
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Causes of Chemical Weathering
1. Acid Rain
Directions:
- Copy the headline and each cause
-Under where you wrote Acid Rain, briefly explain each step of the Acid Rain process in your notebook.
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Regions Sensitive to Acid RainOrso University Challenge Question: Why do Houston, Chicago, and Los Angeles have such low levels of acid rain?
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Causes of Chemical Weathering
2. Water – creates a chemical reaction in certain objects
3. Chemicals – resulting from pollution or internal processes
Foaming pollution on rocks.
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Effects of Chemical Weathering
At PH1, this New Zealand lake is pure hydrochloric acid
Naked trees
Rust
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Analysis
- Create a weathering wonderland. - Sketch a landscape that includes examples
of weathering resulting from each of the 6 causes. (3 mechanical, 3 chemical)
- Label each cause
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Rocks that have split apart due to thermal expansion.
Directions/Requirements
- Need 6 pictures (3 mechanical weathering and 3 chemical weathering)
- Need a caption explaining each cause
- Need a title
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Weathering Wonderland Conclusion
You are the mayor of a new city called Weathering Wonderland.
1. How does weathering harm your city?
2. How can you be proactive in addressing the problems caused by weathering? - List and EXPLAIN three steps you will take to ensure that problems from weathering are minimized.
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Closure
1. Answer the Question of the Day.