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Page 1: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

Weathering, Weathering, Erosion, and Erosion, and DepositionDeposition

Page 2: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

1. Weathering1. Weathering• Weathering is the breakdown of rock

at the Earth’s surface.• Some of these changes happen

quickly and some happen slowly.

• There are 2 Types:– Mechanical and Chemical

Page 3: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

2. Mechanical Weathering2. Mechanical Weathering Mechanical Weathering – the type of

weathering where rock is broken down into smaller pieces without changing the chemical properties of the rock.

This can be caused by freezing and thawing, release of pressure, growth of plants, and actions of animals (including humans).

Page 4: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

• Example: – Water seeps into a

crack in a rock– When the water

freezes, it expands

– The force of the water expanding causes the rock to crack more.

– This is called ice wedging

3. Freezing and Thawing3. Freezing and Thawing

Page 5: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

4. Plant Growth4. Plant Growth• Roots of trees and other

plants enter into cracks of rocks.

• As the plants get bigger, so do the roots.

• The growing roots force the cracks further apart.

Page 6: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

5. Abrasion5. Abrasion• Abrasion is the

grinding away of rock by other rock particles.

• These particles scrape away at other rocks like sandpaper on wood as they rub or roll against the surface.

Page 7: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

6. Chemical Weathering6. Chemical Weathering• Chemical weathering is the

processes of breaking down rock through chemical changes.

• 5 things that cause chemical weathering: water, oxygen, carbon dioxide, living organisms (like lichens) and acid rain.

• Chemical weathering occurs more rapidly in warm wet climates.

Page 8: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

• Chemical Weathering causes the rock to experience a chemical change (changes its makeup)

– Water dissolves rocks over time– Oxygen causes oxidation (rusting)– Acid rain reacts with marble and limestone– Living organisms – plant roots produce weak acids

to dissolve rock around the roots,

7. Chemical Change7. Chemical Change

Page 9: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

ACID RAIN

OXIDATION

Page 10: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

CHECK- UP CHECK- UP What type of weathering do

each example cause?1. The roots of a plant2. An animal scratching3. Oxygen4. Water freezing5. Acid rain6. Wind7. Water

A. Chemical Weathering

B. Mechanical Weathering

C. Both types of weathering

Page 11: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

What type of weathering???

Page 12: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

What type of weathering???

Page 13: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

What type of weathering???

Page 14: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

What type of weathering???

Page 15: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

What type of weathering???

Page 16: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

What type of weathering???

Page 17: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

What type of weathering???

Page 18: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

8. Erosion8. Erosion• When rock and soil are moved from one

place to another by natural forces, this is called Erosion.

• The agents of Erosion are– Water (rain water runoff, streams, rivers,

groundwater, and waves)– Ice (Glaciers)– Wind– Gravity ( landslides, mudslides, avalanches etc.)

Page 19: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

9. Sediment9. Sediment• The material moved

by erosion is sediment.

• Sediment is small, solid particles of rocks or organisms.

Page 20: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

10. Deposition10. Deposition• When the sediment being carried is

dropped (or deposited) in a new area, it is called deposition.

• Depositions can create new landforms like beaches and sand dunes.

Page 21: Weathering, Erosion, and Deposition 1. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and.

CHECK-UP CHECK-UP • Choose

one of the following for each example:

A.) ErosionB.)Deposition

1. A river carrying sand2. Dropping sediment in a

new location3. A glacier picking up a rock

in it’s path.4. A beach is formed.5. How a sand dune is created6. How sediment is moved7. Sand being carried by the

wind in a sandstorm.


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