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Definition: Process by which atmospheric and environmental agents disintegrate and decompose rocks. Two Types of Weathering Mechanical Chemical The process by which rocks break down into smaller pieces by PHYSCIAL means. NO CHANGE in composition!!! 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 Mechanical Weathering Process by which rocks break down as a result of chemical reactions Composition of rock is CHANGED Chemical Weathering Process where elements combine with Oxygen Result Rust or other Oxides 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 Chemical Weathering Precipitation that contains a high concentration of acids due to pollution in atmosphere. What are the forms of precipitation? Chemical vs. Physical weathering Object Weathered Bike Mechanical or Chemical? Chemical Specific Type of Weathering Oxidation Reasoning for Choice Water + Metal= Rust. The change is chemical because a new substance is formed. 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’.