2. Weathering & Erosion

3. Science Concepts The student knows that natural events and human activity can alter Earth systems. The student is expected to: (A) describe and predict the impact of different catastrophic events on the Earth; (B) analyze effects of regional erosional deposition and weathering

4. Learning Objectives The learner will be able to identify erosion. –identify effect of chemicals on land. –identify effect of wind on land. –identify effect of ice on land. –identify effect of water on land. –identify effect of temperature on land. The learner will explain the causes of erosion. The learner will compare the effects of different types of erosion The learner will predict the outcomes of various means of erosion.

5. Engage Mudslide Flooding

6. Explore 1 Take a potted plant out of the pot, with soil intact. Discuss how the roots of the plant help to hold the soil in place. Ask what would happen if the plant was not in a pot, but in the ground and water keep running over it. Introduce the term erosion and discuss how wind, water, and ice can cause erosion. Ask students if and where they have ever seen the effects of erosion. Point out evidence of erosion on the school grounds. Some good examples are often near drains, drain pipes, and at the edges of the blacktop.

7. Flooding

8. Sea Arches

9. Beach Erosion

10. River Erosion

11. Mudslide

12. China’s Yellow River The 1887 Yellow River floods devastated the area, killing between 900,000-2,000,000 people. It was one of the deadliest natural disasters ever recorded. For centuries, the farmers living near the Yellow River had built dikes to contain the rising waters, caused by silt accumulation on the riverbed. In 1887, this rising riverbed, coupled with days of heavy rain, overcame the dikes, causing a massive flood. It was one of the worst floods in history, though the later 1931 Yellow River flood may have killed as many as four million people.

13. Hubbard Glacier in Alaska

14. Matterhorn in Switzerland, a geographical anomaly produced by glaciers

15. Sahara Desert

16. Kalahari Desert

17. Gobi Desert in China

18. Dust Bowl, the man-caused environmental disaster of the 1930s

20. Elaborate

21. Horseshoe Bend