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landslides - Crises of a Planet: Landslides 18:07 Volcanism...

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Crises of a Planet: Landslides 18:07 Volcanism Clicker Q’s: Basalt, most fluid (least viscous) b/c high temp, low silica, rhyolite is opposite Composite (strato) volcano = Mt. St. Helens, huge Landslides Notes:  Due to erosion cycles, mountain uplift is faster than erosion Agents of erosion: wind, water, ice, and gravity -water is a lubricant sea cliffs: supposed to fall down, San Clemente, CA (why build houses on sea  cliff?) angle of repose: constant angle of sand poured, cut by a river or bulldozer, the  angle is constant; natural angle above which gravitational instability occurs,  lubricate w/ water, it’ll flow out Landslides is a generic term: from rock falls (very fast) to soil creep (much  slower)  Rock falls: water freezes and expands (frost wedging builds up at the bottom Boulder rolling on Talus Rock avalanches: not just one rock, entire mtn. coming down, hundreds of mph, 
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landslides - Crises of a Planet: Landslides 18:07 Volcanism...

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