* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Weathering and Erosion - School District 67 Okanagan Skaha
Survey
Document related concepts
Geochemistry wikipedia , lookup
Nucleophilic acyl substitution wikipedia , lookup
Artificial photosynthesis wikipedia , lookup
Acid–base reaction wikipedia , lookup
Electrolysis of water wikipedia , lookup
Water splitting wikipedia , lookup
Composition of Mars wikipedia , lookup
Surface runoff wikipedia , lookup
Biochemistry wikipedia , lookup
Water pollution wikipedia , lookup
Evolution of metal ions in biological systems wikipedia , lookup
Freshwater environmental quality parameters wikipedia , lookup
Transcript
Weathering and Erosion Weathering • The breakdown of the materials of the Earth’s crust into smaller pieces, due to exposure to the atmosphere Mechanical (Physical) Weathering • The process by which rocks are broken down into smaller pieces, without changing its composition. • Types of mechanical weathering: – Frost (ice) heaving and frost (ice) wedging – Plant roots – Wetting and drying (swelling/shrinking) – Friction and impact – Burrowing of animals Frost (Ice) Wedging Frost (Ice) Heaving Plant Roots Friction and Repeated Impact Burrowing of Animals Chemical Weathering • The process that breaks down rock through chemical changes. • The agents of chemical weathering – Water – Oxygen – Carbon dioxide – Living organisms – Acid rain Water • Water weathers rock by dissolving it • Water combines with some minerals (eg. Feldspar) to produce clay • Chemical reaction of water with other substances is called hydrolysis Oxygen • Iron combines with oxygen in the presence of water in a processes called oxidation • The product of oxidation is rust Carbon Dioxide • CO2 dissolves in rain water and creates carbonic acid • Carbonic acid easily weathers limestone and marble Living Organisms • Lichens that grow on rocks produce weak acids that chemically weather rock • Acids are formed when plants and animals decay Acid Rain • Compounds from burning coal, oil and gas react chemically with water forming acids. • Acid rain causes very rapid chemical weathering Rate of Weathering Several factors determine the rate at which rock weathers: • Wet vs. dry climates • The composition of the rock (what minerals it contains) • The amount of surface area exposed Bryce Canyon (Utah) -rocks of different resistance weather at different rates. Erosion • The process by which water, ice, wind or gravity moves fragments of rock and soil. Water Erosion • Rivers, streams, and runoff Ice Erosion • Glaciers Wind Erosion Mass Movements • Landslides, mudslides, slump and creep landslide clip.mpeg