Weathering and Erosion

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. Mechanical 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 Types of Weathering

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

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

7. Slope- land that slants down or up Definitions

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. physical weathering 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. chemical erosion Water wind ice plants animals

15. Physical weathering ________ ___________ 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. freezing melting

16. How does freezing water affect rocks?

18. Chemical weathering ________ ___________ 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 oxidation Rust Iron 3 2 2 3 Iron + Oxygen Rust

19. Lichen ________, 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. Carbonic acid

21. Erosion washing blowing carrying ________ 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. 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