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5 Written questions

5 Matching questions

  1. pool
  2. Erosion equation
  3. physical weathering - unloading
  4. Controlling factors of sediment yield
  5. Thalweg
  1. a deep slow flow besides center
  2. b climate and vegetation, basin size, elevation and relief, rock type, land use and human activity. Small basins have more sediment because of steep slope and mass movements. If basin is large there is less force and more places for deposition
  3. c deepest and fastest part of flow
  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 Driving forces/Resisting forces

5 Multiple choice questions

  1. distance from bed and valley sides (friction), surface slope (steepness), free water at bed (lubrication) - most movement occurs internally at upper levels
  2. sediment accumulation, channel cuts into alluvium, bed and banks are material deposited by river, lowlands, low gradient - sorting (downstream, well sorted, usefull for aquatic environments)
  3. unsorted material deposited by glacier (multiple grain sizes)
  4. 85%
  5. discontinuity of of profile because of tectonic, change in rock erodibility and change in base level

5 True/False questions

  1. Sediment yieldamount of sediment eroded per unit basin area per unit time. Does not equal total sediment eroded from upland areas. Arrives to mouth without being deposited in valley bottom.

          

  2. What happens once sediment enters rivers?- Deposition = force of flow < resistant force & Transport = force of flow > resistance force

          

  3. glacier conditiongaining (+), losing (-) and equilibrium line in middle

          

  4. Erosion in Bedrock channels?Chemical weathering, abrasion, hydraulic action

          

  5. Major players1. Climate and meteorological events 2. Lithology, layering, structural control, gradient and surface material 3. vegetation and land use effect