1. Types of Weathering
Ms. Steele

2. Demo 1 1 out of 2 types of weathering What happened?
What is mechanical weathering?
Physical breakdown of rocks into smaller rocks without changing their chemical composition
What are some other things that may cause mechanical weathering?

3. Demo 2 What is chemical weathering?
A rock is broken down by changings it chemical composition
Part or all of the rock will disappear
What will happen when I place it in water?
Carbonate rocks act the same way when exposed to carbonic acid

4. Lab Time! Wear your safety goggles the entire lab
You will be working with your groups
Let’s go over the procedures as a class!

5. Mechanical Weathering Station
What happened when you shook the jar vigorously?
What changed?
What does this tell you about physical weathering?

6. Chemical Weathering Station
What happened?
Did anything change after 5 minutes?
Was there any sediment created by the shaking?

7. Physical Weathering Disintegration of rock
The rock retains the same characteristics of the original material
Heat, cold
Plants, animals
Abrasion
Frost-wedging
Exfoliation
Root wedging

8. Chemical Weathering
Process whereby the rock’s internal structure is altered by removing or adding elements
A process in which chemicals cause a breakdown of rock
Plant acids
Lichen
Acid rain
Carbonic acid

9. First Word-Last Word W E A T H R I N G