1. Physical Weathering
Mechanical/ physical weathering: The physical breaking up of rock but does not change composition.

2. Chemical Weathering
Chemical Weathering: The change of the chemical composition of minerals or rocks due to chemical reactions.

3. Physical vs Chemical Weathering
Mechanical/ physical weathering, the physical breaking up of rock changing the shape and size of the rock.
Freezing temperatures: Frost/ ice wedging
Water expands by 9% when it freezes
Particles in wind or water: Abrasion
These particles wear a rock down over millions of years
Plant roots: roots move rocks
Pressure from the roots breaks rock apart

4. Physical vs Chemical Weathering
Chemical Weathering: The breakdown and change of the chemical composition of rocks and minerals. It creates new substances. This usually results in a change of color.
Acid precipitation: Hydrolysis
Causes rocks like marble or limestone that contains calcite to dissolve in acidic water
Reaction with oxygen: Oxidation
Forms rust or tarnish

5. Physical vs Chemical Weathering
Occurs strongest in cold areas with a lot of ice and wind
Chemical
Occurs strongest in warm climates with a lot of water (rain) to assist in the chemical reactions.

6. What type of weathering is being shown?
For the following slides identify if there is mechanical or chemical and name the type of each

7. Roots push sidewalk up

8. Over time the low PH of rain in a certain area broke down the rock on this statue

9. Water freezes, expands and causes rocks to cracks

10. The wind caused rocks to hit other rocks and break one another apart

11. Iron minerals react with the air and turn red as a result of the reaction

12. Water reacts with minerals in limestone caves and forms stalactites and saltagmites