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Mass Wasting GLG 101 - Physical Geology Bob Leighty These notes and web links are your primary “lecture” content in this class. Additionally, various articles are assigned each week to supplement this “lecture” information. I believe you’ll have enough information to reference without having to purchase a costly textbook. These lecture notes are very similar to the ones I use in my traditional classes. You’ll find they are loaded with imagery and streamlined text that highlight the most essential terms and concepts. The notes provide a framework for learning and, by themselves, are not meant to be a comprehensive source of information. To take advantage of the global knowledge base known as the Internet, I have included numerous hyperlinks to external web sites (like the Wikipedia, USGS, NASA, etc.). Follow the links and scan them for relevant info. The information from linked web sites is meant to supplement and reinforce the lecture notes – you won’t be responsible for knowing everything contained in them. As a distance learning student, you need to explore and understand the content more independently than in a traditional class. As always, I will help guide you through this learning adventure. Remember, email Dr. Bob if you have any questions about today’s lecture ([email protected]). Leave no questions behind! Explore and have fun! Mass Wasting Mass Wasting Why Do We Care? Before After This South American town was buried by a rock avalanche Mass Wasting What is Mass Wasting? Downslope movement of rock & soil under the influence of gravity Classify on the basis of: 1) material (rock, mud, soil) 2) type of motion (fall, slide, flow) 3) rate (fast, slow) Mass Wasting What is Mass Wasting? Mass wasting & stream erosion sculpt Earth’s surface Mass Wasting Types of Mass Wasting Rockfall Freefall of pieces of bedrock Mass Wasting Types of Mass Wasting Rockfall Talus (scree) – Rockfall debris Mass Wasting Types of Mass Wasting Rockfall Mass Wasting Types of Mass Wasting Rockslide Rapid sliding of bedrock downslope over an inclined weak layer Mass Wasting Types of Mass Wasting Rockslide Caused by weak layers in: > Sedimentary rocks (bedding) > Metamorphic rocks (foliation) > Fractured rocks (joints) Mass Wasting Types of Mass Wasting Rockslide Gros Venture, WY (1925) Mass Wasting Types of Mass Wasting Rock Avalanche Very rapid downslope movement of “dry” bedrock Before After Mass Wasting Types of Mass Wasting Rock Avalanche Mass Wasting Types of Mass Wasting Mudflow Rapid flow of water-saturated mud & rock Mass Wasting Types of Mass Wasting Earthflow Slow-rapid collapse of oversteepened slopes Mass Wasting Types of Mass Wasting Earthflow Mass Wasting Types of Mass Wasting Earthflow Mass Wasting Types of Mass Wasting Earthflow Mass Wasting Types of Mass Wasting Earthflow Mass Wasting Types of Mass Wasting Creep Soil/bedrock slowly moves (creeps) downhill Mass Wasting Types of Mass Wasting Creep Mass Wasting WWW Links in this Lecture > Mass wasting - http://en.wikipedia.org/wiki/Mass_wasting > Rockfall - http://en.wikipedia.org/wiki/Rockfall > Scree - http://en.wikipedia.org/wiki/Scree > Mudflow - http://en.wikipedia.org/wiki/Mudflow > Earthflow - http://en.wikipedia.org/wiki/Landslide#Earth_flow > Creep - http://en.wikipedia.org/wiki/Downhill_creep