1. How does weathering, erosion, & deposition act in a cycle to change the Earth’s surface?
-breaks down the Earth
Weathering
Erosion
Deposition
- moves the Earth
– drops off, to build the Earth

2. What is Weathering? Must occur before erosion can happen
The breaking down of rocks into smaller pieces
Must occur before erosion can happen
No movement is involved
Two types: Mechanical & Chemical
Sediments- small/tiny pieces of weathered down rock.

3. What is Physical Weathering?
Physical/Mechanical weathering …
the breaking down of rocks into smaller pieces with out changing the material
Physical Weathering -- The steep walls here were carved out by moving water
Palo Duro Canyon in the High Plains Eco-Region

4. Enchanted Rock in the Llano Uplift Eco-region
Physical Weathering
1. Animal burrowing
2. Plant Roots
3. Ice Wedging
4. Abrasion
Enchanted Rock in the Llano Uplift Eco-region
5. Exfoliation-warming and cooling
of rocks over time causes rocks
to peel into sheets

5. What is Chemical Weathering?
dissolving and changing the minerals in rocks into new ones.
1. Oxidation-Rusting
2. Plant Acids
3. This cave was formed by slightly acidic water dissolving the limestone (carbonic acids)

6. What is Erosion? Water Wind Water & Gravity Gravity Example
The movement of weathered earth materials by moving water, wind, gravity or ice (glaciers)
Example
Cause of Erosion
Waves eroding the beach and East TX shoreline
Water
Desert Sandstorm in West TX from drought
Wind
Rain causing Mudslide in the Rolling Hills of Central TX
Water & Gravity
Landslide on sides of Plateaus of Central TX
Gravity
Rain carrying soil down a driveway

7. Draw and answer the question
How does removing plants effect the erosion on the left side of the hill?
Draw and answer the question

8. What is Deposition? Before After
Delta
Mountains
Sand Dunes
Plateau
When eroded sediments are deposited in a new location
Example: delta -- where sediment is deposited where
a river flows into an ocean or lake builds up a landform
Before After