1. Good Morning! Tuesday, 11/17 As you come in, turn in your Chemical Weathering Lab

2. Scenario #1  In your backyard there is a small river. You notice over the years that the river keeps getting bigger and bigger. When you examine the sides of the river you can see small parts of the rock that borders the river being chipped away by the moving water and pebbles in the river. You notice that the piece of chipped rock flow down the river with the water. Is this an example of mechanical or chemical weathering? WHY?

3. Scenario #2  In Greece many of the ancient structures made of stone are slowly dissolving. Many people go to see the buildings and art pieces made out of rock from a long time ago. Soon though scientists predict there won’t be any old buildings or statues left because of acid rain. As more and more pollution is put into the atmosphere the more toxic the rain becomes. Is this an example of mechanical or chemical weathering? WHY?

4. Scenario #3  Ground hogs live in the ground. To build a home they have to dig through rock to form a burrow. This creates small pieces of rock that the ground hogs move out of their homes. The ground hogs make their home by breaking the rocks apart. Is this an example of mechanical or chemical weathering? WHY?

5. Scenario #4  One worker noticed that over time the hills are getting smaller and smaller but the rocks on the hills aren’t being broken into pieces. The worker knows that the factory produces a large amount of dangerous acid and a lot of dangerous bases. Is this an example of mechanical or chemical weathering? WHY? In a large company that creates chemicals a lot of waste is produced. One company has been pouring their waste onto some hills behind their factory.

6. Scenario #5  Some snails have tongues that are strong enough to burrow into rock to eat algae that grows in the cracks. They very slowly chip away at the rock causing it to break into smaller pieces. This allows the snail to eat algae in hard to reach places but also helps to create a little bit of sand. Is this an example of mechanical or chemical weathering? WHY?

7. Particle Size  Which type of soil do you think will sink to the bottom? Which type will settle on top?

8. Soil Texture Lab  Hand out  Complete 2 questions on the first page  “Think about and Answer”  Read the next 2 paragraphs

9.  Purpose : To determine the composition of a local soil sample  Some revisions to the lab/Explanations Soil Texture Lab

10. How to determine soil texture