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Warm-Up

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Erosion and Deposition

Lesson Goals

Describe erosion and deposition.Differentiate types of mass

.

Lesson Question

Words to Know

Fill in this table as you work through the lesson. You may also use the glossary to help you.

creep the extremely downhill movement of soil and rocks

deposition the process by which sediment is added to a

location

erosion the process by which of rock are loosened and carried away

landslide the downhill movement of a mass of rock, soil,

and debris

mass movement the movement of and rock debris down a slope

mudflow the rapid downhill flow of a of rock, soil, and water

slump the downward slide of a of rock or soil in one piece

WK2

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Warm-Up Erosion and Deposition

Weathering

Weathering is the of rocks into smaller particles called sediment.

• There are two types of weathering:

• weathering – rocks are physically broken

down into smaller pieces

• weathering – rocks are broken down in a way

that changes their mineral composition

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Erosion and Deposition

Erosion

and erosion work together to wear down and carry away

rocks on Earth’s surface.

• Erosion is the process of transporting to a new

location.

• Agents of erosion include:

• water.

• ice and glaciers.

• wind.

• animals, including .

Deposition

Deposition is the process of sediment being added to a new location.

• sediment:

• falls out of the transporting medium.

• settles on the .

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Instruction

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Erosion and Deposition

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Factors That Affect Rate of Deposition

The rate of deposition is affected by several factors.

Smaller particles settle more slowly.

Round particles settle more quickly.

Particles with higher density settle more quickly.

Shape

Velocity Larger sediment is deposited first.

4 The Cycle That Shapes Earth’s Surface

The cycle of , erosion, and deposition shapes Earth’s surface.

• Weathering breaks down surface material into sediment.

• Erosion transports the sediment.

• puts sediment in new places.

Instruction

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Erosion and Deposition

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7 Mass Movement

Mass movement is the movement of large amounts of and down a slope.

Mass movement is affected by:

• cover on a slope.

• the of a slope.

• the stability of slope.

• Removal of vegetation

• Flowing water

• climate conditions.

The Cycle That Shapes Earth’s Surface

Deposition Erosion

Instruction

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Erosion and DepositionInstruction

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Landslide

A landslide is the rapid downhill movement of a mass of rock, debris, or soil. Landslides:

• are the most type of mass movement.

• are triggered by heavy rains, undercutting of , or

.

Types of Mass Movement

Landslide

Slump

Types of MassMovement

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Instruction Erosion and Deposition

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Mudflow

A mudflow is rapid downhill flow of a mixture of , soil, and water.

• Mudflows occur after heavy rains in areas that are typically .

• Rain mixes with soil to form mud.

• The mud picks up speed and debris as it moves .

• Mudflows can be triggered by .

Slump

Slump is when loosely connected rock and soil move a distance down a slope.

• Materials usually move in a single large mass called a slump .

• Slumps are caused by earthquakes, undercutting, and and thawing.

Creep

Creep is the slow downhill movement of rock and .

• Moves more slowly than other types of mass movement

• Occurs on gentle slopes covered with loose, material

• Often caused by freezing and of water in cracked layers of rock

• May tilt objects such as telephone poles or trees

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Summary Erosion and Deposition

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Review: Key concepts

Erosion transports thesediment.

breaks down surfacematerial intosediment.

puts sediment innew places.

The cycle of weathering, erosion, anddeposition

shapes Earth’ssurface.

Answer

Lesson Question

How do erosion and deposition work together to shape Earth’s landscape?

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Summary Erosion and Deposition

Review: Key Concepts

There are four types of mass movement.

Landslide

• Quick downhill movement of rock and soil

• Quick downhill movement of a mixture of rock, soil, and water

• Sudden downhill movement of a mass of rock and soil in one piece

• Slow downhill movement of rock and soil

Use this space to write any questions or thoughts about this lesson.

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