1. Warm up Monday 12/12 What are the two main types of weathering?
I have your test scores from Friday! You may ask to see your grade after notes! 
Make ups are due Wednesday 12/14
Test Corrections due Friday 12/16

2. Unit 4.1 Weathering

3. Mechanical Weathering
Frost Wedging- alternate freezing & thawing of water

4. Exfoliation- peeling away of large sheets of loosened material

5. Abrasion- when rocks rub against each other

6. Chemical Weathering
Oxidation- when oxygen unites chemically with a mineral. Ex. Rust (iron oxide)

7. Hydration- when water unites chemically with minerals.

8. Mechanical Weathering
Chemical weathering
Pressure/stress release
Organic acid (moss, lichen, or pine needles)
Abrasion by wind, water, or human activity
Hydrolysis (reacting with water)
Gravity (mass wasting)
Acid precipitation
Exfoliation
Hydration (dissolving in water)
Ice wedging
Oxidation (metal and oxygen)
Biological (animal burrows, roots)

9. Rates of Weathering
Surface area - If particle size goes down then, weathering rate goes up (more surface area exposed).
Weathering eats away sharp edges first (makes things round)

10. Rates of Weathering
Climate- the average weather of a location over time

11. Differential Weathering
Different minerals weather at different rates.
Hard rocks weather slowly
Soft rocks weather quickly

12. Warm up Tuesday 12/13
Come get a cup from the front of the room, but DO NOT open it until I tell you to do so! (one per table!)
Which type of weathering will be fastest? Record you answer on your lab handout under “Hypothesis”

13. Sugar Cube Weathering Lab
These Sugar Cubes are NOT meant to be eaten!
Be sure to record your times accurately in SECONDS!
Your data should be represented using a BAR GRAPH which should include…
-A title
-Labeled axies
Answer the Analysis quests in COMPLETE SENTENCES!

14. 5 Minute Timer
GBHn-18