Weathering breaks rocks down through physical or chemical processes. Mechanical weathering involves physical breakdown by freezing and thawing or abrasion. Chemical weathering involves chemical reactions, like iron reacting with oxygen and water to form rust. Erosion then transports the weathered material through wind, water or ice. Sediment is deposited when erosional agents can no longer carry the material, completing the weathering and erosion cycle.

1. Weathering And Erosion

2. Weathering
• Weathering
• The process that
breaks down rock and
other substances on
Earth’s Surface.

3. 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.

4. Release ofRelease of
PressurePressure AbrasionAbrasion
Freezing and Thawing.Freezing and Thawing.

5. • 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

6. Water
• Water weathers rock by dissolving it.

7. Oxygen
• Water + Oxygen
+Iron = RUST
• When water and
oxygen mix with
Iron it creates
rust. This is
called oxidation.
• Rust video

8. Carbon Dioxide
• Carbon dioxide
dissolves in rain
water and produces
Carbonic acid.
• This
Carbonic
acid easily
weathers
marble and
Limestone.
• Cave_formation vide

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

10. Acid Rain
Acid rain video clip
• Pictures of weathering
• When pollution
from the air
contaminates
the rain, it
causes rapid
chemical
weathering.

11. Erosion

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

13. • Difference
between
weathering and
erosion
• Weathering
breaks earth
down and
erosion moves
the broken
pieces around.
1 min video segment on weathering an

14. • 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.

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

16. Weathering breaks it.
Erosion moves it.
Deposition drops it.
What is it? Sediment!

17. Please sing aloud to the tune of Row Row Row
Your Boat
Ero ro ro sion
Moves sediment down the
stream
Gravity, wind, water, and ice
Deposition is what is seen

18. Weathering and Erosion
Types of Mechanical WeatheringAgentsofWeatheringandErosion
EffectsofWeatheringandErosion
Types of Chemical Weathering