Weathering: Nothing Stays the Same

Nothing Stays the Same
Identify and observe effects of events that require time for changes to be noticeable including growth, erosion, dissolving, weathering, and flow.
Do you know any of these people?
Do you know their birthdays?
Put them in order from youngest to oldest. Rock Candy 1:
Compare and describe the 3 candies in your journal.
Place "rock" candy in your mouth between your teeth. Then, swish saliva or "stream water" back and forth over the candy without moving it. Time how long it will take for the "rock" to dissolve. Rock Candy 2:
At the same exact time, everyone place rock candy #2. When placing it in your mouth begin to tumble the rock with the toungue against the teeth or "other rocks in the stream." Time how long it tkaes for this rock to dissolve and record tin the data table. Rock Candy 3:
Place the final rock in your mouth. Bite once to break the rock and begin to tumble the rock against the other rocks in the stream (no chewing!). Record your final time that it takes to dissolve.

Journal Questions:
1. Which "rock" weathered fastest?
2. What factor or factors are responsible for the different weathering?
3. What places where two surfaces touch were present in each test?
4. What would happen if you increased the size of the rocks?
5. How does your information differ from the class average?
6. What might be a cause of these differences?
7. What can you say about the relationship between amount of motion and weathering rate?
8. What can you say about the relationship between rock size and weathering rate?