1. Unit 5 Weather, Erosion & Deposition
Weathering notes
What is weathering? How does it effect objects?

2. This unit you will learn
What is and what are the factors of weathering.
What is and what are the factors of erosion.
What is and what are the factors of deposition.
The difference between soil and dirt! Yes there is one.
Types of weathering, erosion & deposition.
Mass movements
Glaciers
Rivers
Landscape regions

3. Much of this unit is review?!
So, let’s try to use this unit to get your grade up before the last few units of the year.

4. Definitions for the day
Weathering
Chemical weathering
Physical weathering
Surface area
Abrasion
Frost action
Root Pry
Oxidation

5. Weathering The process of breaking down material.
Occurs naturally when exposed to the elements (like wind, water, plants and animals)

6. Exposure Exposure to: How does this affect weathering Wind
Rain, Sleet, Snow
Biologic activity
How does this affect weathering

7. Weathering rates? Depends on how hard or resistant the material is
Surface area- the amount of area available to be weathered.
If we increase the surface area what will happen to the amount of potential weathered area?

8. Let’s try?! SA=L x W x # of sides 4 cm * 4 cm * 6 sides SA= 96 sq cm
L-Length
W-Width
4 cm * 4 cm * 6 sides
SA= 96 sq cm
4 cm
4 cm
4 cm

9. You try
SA=____x___x____
SA=2 * 2 * 6
SA= 24 sq cm
2 cm

10. Now what? What if we cut the cube in half? OLD SA= 24 sq cm
NEW SA= ???
SA= 1 * 1 * 48 sides
SA= 48 sq cm
INCREASE SA = Decrease in size!!
1 cm

11. Physical Weathering
Changing the shape and or size of an object without changing the chemical make up.
Types
Frost action
Water seeps into cracks and freezes pushing open crack as it expands.
Abrasion
When two objects collide
Exfoliation

12. Chemical Weathering Changing the chemical makeup of a material. Types
Oxidation
Hydration
Carbonation

13. Take note
Chemical – End does not equal the same thing as the beginning!
Physical- End same as beginning!
So, if something has undergone physical weathering then the ending object is the same chemically as the beginning. If an object has been chemically weathered then the end object is different from the beginning object.

14. You try! A rock hitting another rock? C or P A pot hole? C or P
A rock with a red coloring? C or P
A bonfire? C or P
A tree with roots in the bed rock? C or P
Hitting a hammer on a rock? C or P
Putting a tooth in a cup of Pepsi? C or P P P C C P P C