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Weathering Chapter 10 Section1 What is weathering? Mechanical (Physical) Weathering Definition: Mechanical weathering is the breakdown of rock into smaller pieces by physical means Weathering is the process by which rock materials are broken down by the action of physical or chemical processes Chemical Weathering Definition: The process by which rocks break down as a result of chemical reactions is called Chemical Weathering Examples: rock fall…rocks tumbling and hitting other rocks Examples: List the agents of Mechanical (Physical) Weathering List the agents of Chemical Weathering Water Ice Wind Gravity Plants and Animals Ice Wedging Water Acid Precipitation Acids in groundwater Acids in Living things Air Explain how water can cause chemical weathering to occur. Definition: Ice wedging occurs when water filling a crack in a rock freezes and expands and eventually breaks down the rock Along with weak acids and air, water can weaken the bonds between mineral grains Abrasion What are the 3 main types of precipitation? Definition: Rain sleet or snow The grinding and wearing away of rock surfaces through the mechanical action of other rocks or sand particles Define acid precipitation Rain, sleet, or snow that contains a high concentration of acids -. What can acid precipitation result from? Acid precipitation can result from The burning of fossil fuels Name 3 agents that can cause abrasion and explain WHY. 1. Gravity: When rocks fall on one another (rockslide) 2. Explain how lichens cause chemical weathering Lichens grow on rocks. Lichens produce acids that can slowly break down rock. Wind 3. Water: When rocks and pebbles roll along the bottom of swiftly flowing rivers, they bump into and scrape each other. Explain how plants can cause mechanical weathering. The chemical reaction in which an element, such as iron, combines with oxygen to form an oxide is called Plants’ roots can grow into cracks in rocks. As the plants grow, the force of the expanding root becomes so strong that it can split the rock. Oxidation In what ways can an animal cause mechanical weathering? An animal causes mechanical weathering by burrowing in the soil and moving soil particles around Also, name some animals that can cause this type of weathering. When oxygen in the air reacts with metal, oxidation occurs and causes the metal to Rust What agent can weather something either mechanically or chemically? Water Draw a Venn diagram comparing and contrasting mechanical and chemical weathering.
