1. Weathering and Erosion

2. Student Objectives
Analyze effects of regional deposition and weathering

3. Definitions
Weathering- mechanical or chemical surfaces processes that break rocks into smaller pieces

4. Types of Weathering Mechanical Example: Chemical Example:
Breaks materials down
Same properties as the original material just changes in size
Example:
Gravel becoming smaller
Chemical
Breaks materials down
Change of properties, material becomes a totally new substance
Example:
Iron rusting

5. What type of weathering is this: mechanical or chemical?

6. Can you tell what animal lies atop this stone?

7. Definitions
Slope- land that slants down or up

8. Definition
Erosion- process in which surface materials are worn away and transported from one place to another by agents such as gravity, water, wind, and glaciers

9. Definitions
Deposition- dropping of sediments that occur when an agent of erosion such as gravity, wind, or water loses its energy and can no longer carry its load

10. Erosion and Weathering
Video Narration/
Question and Answering

11. Student Objectives
Define the differences between weathering and erosion
List the agents of erosion
Define physical weathering, chemical weathering, and erosion
Describe how wind, water, ice, and gravity affect the surface of earth

13. The forces of nature not only build up the land but also wear it down
The forces of nature not only build up the land but also wear it down. These major processes are _________ ____________, __________weathering, and __________.
_______, _______, ______ and even _______ and ___________ all play their part in turning the mightiest mountains into the tiniest grains of sand.
physical weathering
chemical
erosion
Water wind ice
plants
animals

15. ________ ___________ is the actual breaking down of rock by the action of natural forces, such as water, wind, ice, plants and animals.
The most common cause of physical weathering is due to constant ________ and _______ of water in and around rocks.
Physical weathering
freezing melting

16. How does freezing water affect rocks?

18. ________ ___________ causes changes in the rocks from the reaction of different chemicals on the surface of the rocks.
The most common example of chemical weathering is called ____________. _______is an example of oxidation.
________ changes into oxidized iron (rust).
Fe + O Fe O
Chemical weathering
oxidation Rust
Iron
Iron + Oxygen Rust

19. ________, a plant that covers rocks, is an example of chemical weathering. This plant secretes a mild acid, _____________, that eats away or dissolves the surface of rocks.
Lichen
Carbonic acid

21. ________ is the process of ___________, __________, or ____________ away weathered rock material.
Water, wind, ice, and gravity all serve in eroding- ____________ weathered material greater distances, but _________ is the most significant force of erosion.
Erosion
washing
blowing carrying
transporting
water

22. What are 3 ways water erosion can happen?
____________________________________________________
Lifting rocks, grinding rocks, dissolving rocks

23. Examples of Erosion
Rocky Mountains Grand Canyon

25. Glaciers
__________, huge sheets or mountains of ice that melt after a ice age or during global warming leave behind ice-carved valleys.
Yosemite Valley

28. Wind erosion
____________ causes tiny grains of sand to be carried causing polishing and reshaping.
Sand dunes

31. Video Quiz

32. Video Quiz
Soil: Broken (disintegrated) rock, humus, plants and animals

33. Video Quiz
Mass wasting