1. Weathering and Soil Formation
Bell Ringer: In your IAN, After the Unit 2 Title Page, label: Chapter 10
Weathering and Soil Formation
Then, glue in your new standards .

2. Describe how water, acids, and air cause chemical weathering of rocks.
Chap 10, Sec 1 (Weathering)
Objectives: Please copy in your IAN!
Describe how ice, water, wind, gravity, plants, and animals cause mechanical weathering.
Describe how water, acids, and air cause chemical weathering of rocks.
Does size make a difference?

3. “DIRTY WORDS” Basics Due 10/4 3 minute presentation minimum
Creative, Innovative, Visual Aid
No power point
Rubric Included
Examples?

7. Let’s dig a little deeper!
Now, back to Weathering!
Let’s dig a little deeper!

8. Two hundred years ago, a forest grew where these barren canyons are now. Today, the towering walls of Providence Canyon in southwestern Georgia stand as a testament to the power of rushing water. In the early 1800s, farmers cleared the land to make room for crops. In less than 200 years, rains and flash floods eroded the soil to form the canyons.
What went wrong?

9. Well, when you go on a walk, have you ever seen small rocks laying along the side of the path? **Where did they come from? **Why do you think they are they there?

10. There are 2 Types of Weathering= Mechanical and Chemical
Mechanical Weathering: the breakdown of rock into smaller pieces by physical means.
Agents of mechanical weathering include ice, wind, water, gravity, plants, and even animals.

11. Examples of Mechanical Weathering:

12. Examples of Mechanical Weathering: 1
Examples of Mechanical Weathering: 1. ice wedging – a type of frost action (weathering from ice) occurs when wedges of ice in rock widen and deepen the existing cracks.

13. 2. Abrasion- the grinding away/rubbing of rock by rock particles carried by water, ice, wind, or gravity.
As you scrape a piece of chalk against a board, particles of the chalk rub off to make a line on the board and the piece of chalk wears down and becomes smaller. The same process, called abrasion, happens with rocks.

14. Abrasion Examples in Nature
Water: When rocks and pebbles roll along the bottom of swiftly flowing rivers, they bump into and scrape against each other. The weathering that occurs eventually causes these rocks to become rounded and smooth.
Wind : When wind blows sand and silt against exposed rock, the sand eventually wears away the rock’s surface to a smooth sheet.
Gravity : Avalanches; rocks fall on one another. You can imagine the forces rocks exert on each other as they tumble down a mountainside, jagged in appearance.

15. Other factors of Erosion in Nature? Plants & Animals

16. 3. Plants:
Plants often send their roots into existing cracks in rocks. As the plant grows, the force of the expanding root becomes so strong that the crack widens.
You may not think of plants as being strong, but some plants can easily break rocks. Have you ever seen sidewalks and streets that are cracked because of tree roots? Roots don’t grow fast, but they certainly are powerful!

17. 4. Animals:
Believe it or not, earthworms cause a lot of weathering! They burrow through the soil and move soil particles around. This exposes fresh surfaces to continued weathering. Would you believe that some kinds of tropical worms move an estimated 100 metric tons of soil per acre every year?
Ants, worms, mice, coyotes, and rabbits are just some of the other animals that contribute to weathering.

18. 4. Chemical Weathering- The process by which rocks break down as a result of chemical reactions. Common agents of chemical weathering are water, weak acids, and air.

19. Natural Examples of Weathering Sort:
Weathering 2) Erosion 3) Deposition
(paste the 3 green slips down, then later organize the pink examples (1-16) that belong with the tech term, below it!)

20. In Summary: Paste organizer from “Wacky Weathering PPT”
in your IAN and solve first 4 boxes.