Weathering And Erosion

Weathering

• Weathering • The process that

breaks down rock and other substances on Earth’s Surface.

Two Types of Weathering

• Mechanical Weathering

• Examples:

• A type of weathering in which rocks are physically broken into smaller pieces. A physical change includes change in size and shape.

• Freezing and thawing, animal actions, abrasion.

• What is mechanical weather video clip.

Release of Release of PressurePressure AbrasionAbrasion

Freezing and Thawing.Freezing and Thawing.

• Chemical Weathering

• Chemical change caused by a chemical reaction. One substance changes into another.

• Example:• Iron + Water +

oxygen = Rust

Chemical Weathering Clip

Chemical_Weathering.video

Water • Water weathers rock by dissolving it.

Oxygen• Water + Oxygen

+Iron = RUST

• When water and oxygen mix with Iron it creates rust. This is called oxidation.

• Rust video

Carbon Dioxide• Carbon dioxide

dissolves in rain water and produces Carbonic acid.

• This Carbonic acid easily weathers marble and Limestone.

• Cave_formation video clip

Living Organisms

• Some plants and animals can produce weak acids that chemically weather the rock.

Acid Rain

Acid rain video clip• Pictures of weathering

• When pollution from the air contaminates the rain, it causes rapid chemical weathering.

Erosion

• Erosion • The movement of rock and particles by wind, water, ice or gravity.

• What_Is_Erosion video clip

• Erosion video clip

• Difference between weathering and erosion

• Weathering breaks earth down and erosion moves the broken pieces around.

1 min video segment on weathering and erosion

• Sediment

• Deposition

• Gravity

• Is the material moved by erosion .

• Occurs where the agents of erosion lay down the sediment. (drop it off)

• The force that moves rock and other sediment downhill. Gravity causes mass movement of sediment.

• Weathering, Erosion, and Deposition act together in a cycle that wears down and builds up Earth’s surface.

Erosion Weathering Deposition

mass movement animation

Weathering breaks it. Erosion moves it.

Deposition drops it.

What is it? Sediment!

Please sing aloud to the tune of Row Row Row Your Boat

Ero ro ro sionMoves sediment down the

streamGravity, wind, water, and iceDeposition is what is seen

Weathering and Erosion

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Types of Chemical Weathering