Weathering, Erosion, and Deposition

I. WeatheringA. Weathering is the process of breaking rocks

into smaller pieces.1. Mechanical Weathering happens when a

physical force breaks rocks apart.

What forces do you think might

break down rock?

I. WeatheringA. Weathering is the process of breaking rocks

into smaller pieces.1. Mechanical Weathering happens when a

physical force breaks rocks apart.a. Abrasion

1) Abrasion happens when rocks bump or scrape each other and break off pieces of each other.

2) Wind, flowing water, or glaciers can cause abrasion.

What factors do you think affect

how much abrasion happens

in a river?

What could have cracked

up these rocks? (I’m

pretty sure it wasn’t my

jokes.)

I. WeatheringA. Weathering is the process of breaking rocks

into smaller pieces.1. Mechanical Weathering happens when a

physical force breaks rocks apart.a. Abrasion …b. Ice Wedging

I. WeatheringA. Weathering is the process of breaking rocks

into smaller pieces.1. Mechanical Weathering happens when a

physical force breaks rocks apart.a. Abrasion …b. Ice Wedgingc. Plant root growth

I. WeatheringA. Weathering is the process of breaking rocks

into smaller pieces.1. Mechanical Weathering happens when a

physical force breaks rocks apart.a. Abrasion …b. Ice Wedgingc. Plant root growthd. Animal Actions

Why are these rocks that red-orange color?

Do you think rocks are more or

less likely to break if they

contain rusted iron?

I. Weathering

A. Weathering is the process of breaking rocks into smaller pieces.

1. Mechanical Weathering …2. Chemical Weathering happens when

chemicals in a rock react with other chemicals around it making the rock weaker.

1. Iron in rocks can rust. (oxidation)2. Acid rain can react with carbonate in rocks.

II. Erosion

A. Erosion occurs when rock or soil is carried away.

B. Causes of Erosion1. Water running down hill (rivers, streams)2. Glaciers (rivers of ice)3. Wind4. Gravity (landslides, mudslides)

How was this landform created?

III. DepositionA. Deposition occurs when soil or rock are set

down in a new location.B. Effects of Deposition

1. Rivers and streams create deposits called deltas and alluvial fans. (creates fertile soil)

What is the source of the soil deposited in this

delta?

III. DepositionA. Deposition occurs when soil or rock are set

down in a new location.B. Effects of Deposition

1. Rivers and streams create deposits called deltas and alluvial fans.

2. When wind deposits sand, it forms dunes.

III. DepositionA. Deposition occurs when soil or rock are set

down in a new location.B. Effects of Deposition

1. Rivers and streams create deposits called deltas and alluvial fans.

2. When wind deposits sand, it forms dunes.3. When waves deposit sand on the shore,

beaches form.

How did this piece of wood

get here? What about all that other stuff?

III. DepositionB. Effects of Deposition

1. Rivers and streams create deposits called deltas and alluvial fans.

2. When wind deposits sand, it forms dunes.3. When waves deposit sand on the shore,

beaches form.4. Sediments form layers that can eventually

become rock. (lithification)

Weathering and Erosion Supe r Hero Cartoonhttp://adventuresinscience.edublogs.org/tag/animation-videos/