1. Creating and destroying land
Changing the way Earth’s surface looks
Creating and destroying land

2. 3 forces work together to change the way the Earth looks over long periods of time
Weathering- breaks down earth
Erosion-moves earth
Deposition-builds up new land

3. Weathering

4. Weathering
is the process of breaking rock material down into smaller pieces

5. There are 2 types of weathering
Mechanical
Physically changes the rock
Simply breaking the rock into smaller pieces
caused by:
Freezing and thawing
Gravity
Plant roots
Abrasion (Being beaten up by other rocks in the water or wind)

6. caused by: Acid precipitation Weak acids found in plants Air pollution
Chemical
Chemically changes the rock making it easier to break
Makes the rock soft and holey
caused by:
Acid precipitation
Weak acids found in plants
Air pollution

7. Both types of weathering can happen at the same time on the same rock

8. How fast weathering happens depends on:
Kind of rock
Hardness of rock (harder rocks weather slower)
Climate and temperature (chemical is slower in cooler temps)
Size and shape of the rock (larger rocks weather slower)
Elevation
This is called differential weathering