Warm- up: Metric MondaySuppose it takes 500 years to form 2 cm of new soil without erosion. If a farmer needs at least 35 cm of soil to plant a particular crop, how many years will the farmer need to wait before planting the crop?Hint: Find the rate: 500years/2cmHint: Then multiply by the amount (35cm)

Warm-up: Metric Monday

How many milliliters in 12 liters?

235 cm = __________ m

Prediction: Mass Movement(IAN # 100)

Predict what will happen when the pan of soil is shaken.

Predict what will happen when it “rains” heavily on the soil.

Erosion (IAN #101, 103, 105)

Erosion: The process by which natural forces move weathered rock and soil from one place to another.

Erosion Song (to the tune of row, row, row your boat)

Ero, ro, ro, sion, moving rock,soil,sand.

Carrying, carrying, carrying, carrying sediments across the land.

Erosion

The material moved by erosion is called sediment.Deposition occurs where the agents of erosion “drop off” the sediments.Weathering, erosion, and deposition act together in a cycle that wears down and builds up Earth’s surface.

Erosion: What is happening in the picture?

Mass Movement

What is the force that moves rock and other materials downhill?

GRAVITY!

Gravity causes mass movement.

Types of mass movement

Landslides:

Most destructive kind of mass movement.

Rock and soil slide quickly down a steep slope.

What do you think caused this landslide?

The LaConchita Landslide of March 1995 in Ventura County, along the California coast.

Types of Mass Movement cont.

Mudflows

Rapid downhill movement of a mixture of water, rock, and soil.

Often occurs after heavy rain.

Earthquakes can trigger Mudflows and Landslides.

Mudflow: Watch out!

Mass Movement cont.

Slump

When a mass of rock and soil suddenly slips down a slope.

Moves in one large mass.

Slump

Warm-up: Tuesday

Describe how a raindrop can start the process of erosion.

Water Erosion (IAN #104)

Predict: What will happen when water is “rained” on the sand hill.

Drop 10 drops of water on your sand hill.

Describe what happens.

Drop 20 more drops and describe.

Continue to drop water until water runs out.

Write a summary of what occurred.

Water is the major agent of erosion.

Warm-up: CRCT ReviewPlease write question

What can cause the loss of soil that is not protected by plant cover?

A. Erosion by water or wind

B. Too many organisms in the soil.

C. Slow the rate of soil formation.

D. Chemical Weathering.

Erosion Video (IAN # 106)

What are the types of erosion?

How does erosion change Earth’s surface?

Warm-up: ThursdayPlease write the question

1. When a fast moving river slows down, what type of sediment would be deposited first?

A. Silt

B. Clay

C. Sand

D. Gravel

2. Bacteria and fungi in soil are called ____ because they break down dead plants and animals.

Decomposers

Double-Bubble:Compare and Contrast Weathering and Erosion

Include types of weathering and examples (acid rain, abrasion, ect.)

Include types of erosion.

Review1. Tributary2. Abrasion3. When hits a mountain or type of obstacle4. Chemical5. Gravel6. By freezing and thawing of ice7. Wind or water erosion8. Mechanical weathering9. Break down (mix) soil and add nutrients and humus10. soil

Review11. Ice age

12. Climate

13. Chemical Weathering

14. water

15. Decomposers

16. Acid Rain

17. Erosion

18. Horizon