1. Weathering Processes

2. Weathering Two Types of Weathering
Definition: Process by which atmospheric and environmental agents disintegrate and decompose rocks.
Two Types of Weathering
Mechanical Chemical

3. Mechanical Weathering
The process by which rocks break down into smaller pieces by PHYSCIAL means.
NO CHANGE in composition!!!

4. Abrasion
Mechanical Weathering
The grinding and wearing away of rock surfaces through the mechanical action of other rocks or sand particles.
Causes: Gravity, Running Water, and Wind

5. Mechanical Weathering
Ice
Wedging

6. Organic Weathering
Mechanical Weathering

7. Chemical Weathering
Process by which rocks break down as a result of chemical reactions
Composition of rock is CHANGED

8. Oxidation Process where elements combine with Oxygen Result Rust
Chemical Weathering
Process where elements combine with Oxygen
Result Rust
or other Oxides

9. Carbonation: The conversion of rock into a carbonate. Organic Acids
Chemical Weathering
Hydrolysis: Chemical reaction between water and the rock that forms two or more new substances.
Carbonation: The conversion of rock into a carbonate.
Organic Acids
Produced naturally by organisms like Lichen and Moss

10. Acid Precipitation
Chemical Weathering
Precipitation that contains a high concentration of acids due to pollution in atmosphere.
What are the forms of precipitation?

11. Video…
Chemical vs. Physical weathering

12. Mechanical or Chemical? Specific Type of Weathering
‘Dear Diary’
Object Weathered
Mechanical or Chemical?
Specific Type of Weathering
Reasoning for Choice
Water + Metal= Rust. The change is chemical because a new substance is formed.
Bike
Chemical
Oxidation

13. Exit Ticket
Write an answer on the back of your chart:
Write your own journal entry. The entry must be a minimum of 5 sentences, and at LEAST 4 examples of weathering must be used. This CANNOT be the same as ‘Dear Diary’.