Weathering Processes

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

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

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

Mechanical Weathering Ice Wedging

Organic Weathering Mechanical Weathering

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

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

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

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

Video… Chemical vs. Physical weathering

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

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’.