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5 Written questions

5 Matching questions

  1. soil creep
  2. deposition at river mouths
  3. glacial striations
  4. Capacity
  5. physical weathering - unloading
  1. a max. amount of solid sediment that a river can move at a given discharge
  2. b occur when a river reaches base level, flat surface or standing water. Alluvial fans or Deltas. Due to reduced velocity. Many tributaries appear.
  3. c long, straight scratches (evidence of glacier) - rates of up to 5 mm/yr. influenced by amount of debris, basal sliding velocity, ice thickness (pressure), hardness of bedrock, basal water pressure and removal of rock material
  4. d 1. deeply buried rocks are under high pressure, 2. erosion removes overburden - decreases pressure - physical heaving of rock 3. layers of rock peel off into widely spaced sheets - sheeting structures and exfoliation domes, granular/disintegration (grains loosen and fall out)
  5. e alternate feeze/thaw or wet/dry cycles - needle ice, as water freezes it pushes particles up, they fall downslope with gravity when they unfreeze. Slow downslope movement of soil and rock due to expansion and contraction (.1 to 15 mm a year). Very shallow - only upper part of soil, irregular movement that depends on slope angle and soil type

5 Multiple choice questions

  1. earthquakes, increased water content, decreases in slope strength due to weathering. Physical, chemical, anthropomorphic and biological
  2. soil layer churned by frost action
  3. impact of falling drops, effective with sparce vegetation, amount of erosion depends on kinetic energy - not effective in transport of sediment - depends a lot on slope!
  4. below a lake, inside frozen layer
  5. from snow that doesn't melt in summer. snow plus water = more weight and pressure and snow transforms to ice. Why? pressure decreases air space, increases density and leads to consolidation and re-crystallization of snow into large crystals of snow ice (rough and granular)

5 True/False questions

  1. glacierunfrozen patches. through, closed or open

          

  2. ice wedgeglacier acts as a bulldozer, pushing limited amount of loose rock debris

          

  3. degradationremoval of weathered material from one place to another - transport

          

  4. factors that influence weathering...simultaneous physical and chemical weathering. character of bedrock (resistance, solubility, jointing/fractures), climate (temperature and precipitation), slope aspect, vegetation cover

          

  5. hornamount of sediment transported at a given discharge