Before watching the video write these questions down. What is weathering? How does this happen? ...
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Transcript of Before watching the video write these questions down. What is weathering? How does this happen? ...
Chapter 7Weathering and Erosion
Before we begin understand:
Introduction to Weathering and Erosion
http://www.youtube.com/watch?v=R48zYr-S7v0 Before watching the video write
these questions down. What is weathering? How does this
happen? What is erosion? How does this
happen? Based on what you now know: How
did the Santa Elena Canyon form? Explain.
Graham Cracker Activity
Listen to the teacher for instructions. Please use the paper towel to prevent mess.
Chapter 7 Word Study Guide Weathering Mechanical
Weathering Frost Wedging Chemical
Weathering Oxidation Erosion Deposition
WORD
Definition
Your Definition
Picture
Composition Notebook
Let’s make a book!
Weathering
Examples of weathering With your table partner, discuss what
is going on in these pictures. What is happening?
Mechanical Weathering
The type of weathering in which rocks and minerals break down into smaller pieces. Physical Weathering
Factors Temperature Pressure
Temperature (Notebook)
On page 164 What property of water leads to the
weathering of rocks? Explain (Think about states of matter)
What is frost wedging?
Pressure (Notebook)
Read page 165 Give two
examples of how pressure can help in the weathering process.
Chemical Weathering (Notebook)
What is the difference between mechanical (physical) weathering and chemical weathering?
Agents: Water Oxygen Carbon dioxide Acid precipitation
Weathering Agents
Water Good solvent
Oxygen Oxidation Iron can combine with atm O2 (form new
minerals) Carbon Dioxide
Weak acid precipitation (CO2 + H2O) Dissolves certain rocks
Acid Precipitation SO2, CO2, NO’s (Combine with O and H2O) <5.6 on pH scale Burning fuels
Rate of Weathering
Happens very slowly Effects
Climate Composition Surface area Topography
Climate
Temperature, precipitation, evaporation (Chemical)
Cool Climates (physical) With your shoulder partner
Why does cool climates not aid in chemical reactions?▪ Think states of matter.
Rock Type and Composition Different materials
break down at different rates. Put a piece of paper out
in a rain storm Put a piece of wood out
in a rain storm Hardness
Surface Area
Increase in surface leads to an increase in chemical weathering. Smaller pieces = faster
Topography
What is topography? Level ground = Less weathering Slopes = More weathering.
Turn In
Paragraph form: At least ½ page You will get extra credit for having more
than ½ page. Use the four steps to writing.
Explain how climate, composition, surface area, and topography speed up or slow down weathering.
Composition Notebook
Explain how the rate of reaction speeds up and slows down when it comes to weathering. MAKE SURE YOU USE EXAMPLES AND
EXPLAIN