1. Physical and chemical weathering

2. Weathering-breaking down rocks
Two types:
1. Mechanical weathering-just breaks it down and does not have a chemical change
2. Chemical weathering-the rock’s minerals change into different substances

3. BrainPOP-weathering

4. Mechanical weathering
Causes:
1. Ice wedging- water freezes in cracks and expands breaking the rock
2. Animals digging (claws)
3. Plant roots growing (pressure)

5. Chemical Weathering Causes: Reactions 1. rainwater (acid rain)
2. oxygen (reacts with iron-makes rust)
3. carbon dioxide
4. acids of plant decay.
5. sulfuric acid

6. pH scale

7. pH scale Acidic is below 7 Alkaline (or base) is above 7 Neutral is 7
Find your examples from the pH scale substances listed in that area for your notes

8. BrainPOP- pH scale

9. Table 2 (worksheet) Lab experiment: Chalk in vinegar
Record what it looks like at start
Watch overnight
What does chalk look like next day

10. Table 3 (worksheet) Examine sugar cube at start
Examine sugar cubes after shaking 20 times
Examine sugar cubes again after shaking 20 times

11. Table 1 (worksheet) 1-tap water 2-rainwater 3-lemon juice 4 cola
5 ammonia