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19 Matching questions

  1. ________ are characteristics of downcutting streams and a youthful stage of valley evolution.
  2. At the head of a delta, the major channel splits into smaller channels that follow different paths to the sea. These smaller channels are known as ________.
  3. Which of the following must result in a lower base level for rivers and streams?
  4. Many larger rivers in the Colorado Plateau region meander in deep, narrow canyons and have no floodplains. How could this happen?
  5. A ________ stream pattern develops on lands underlain by tilted or folded, alternating hard and soft, sedimentary strata.
  6. ________ is not part of the hydrologic cycle.
  7. Which of the following is the only correct response concerning the location and causes of the extraordinarily severe, 1993, flooding on the Mississippi River and tributaries?
  8. A natural, meandering, river channel is modified into a more or less straight and smooth, canal-like channel. Which of the following statements is correct?
  9. Which one of the following would cause stream rejuvenation?
  10. A ________ stream pattern is developed only on growing mountains like volcanoes or where the land surface is tectonically doming upward.
  11. Which of the following is the correct definition of stream gradient?
  12. A stream begins at an elevation of 200 meters and flows a distance of 400 kilometers to the ocean? What is the average gradient?
  13. In the absence of cutoff, how does a river meander loop behave over time?
  14. ________ is an abandoned, cutoff, meander loop.
  15. ________ generally constitutes the highest percentage of the annual sediment load moved by a stream.
  16. How does urbanization (paving, etc.) affect runoff and infiltration in a small, previously forested, drainage basin?
  17. Where is erosion concentrated along a meandering stream?
  18. ________ make up the suspended loads of most rivers and streams.
  19. ________ describes the total sediment load transported by a stream.
  1. a Rapids and lots of whitewater
  2. b Silt and clay-sized detrital grains
  3. c The gradient is lowered as the channel lengthens and migrates toward the cut or outer bank of the loop.
  4. d 0.5 m/km
  5. e distributaries
  6. f the land is uplifted
  7. g trellis
  8. h Capacity
  9. i radial
  10. j upper basin; very heavy, sustained rainfall in the late spring and early summer
  11. k The natural channel had a lower gradient and higher friction than the straight channel.
  12. l Suspended load
  13. m An oxbow
  14. n infiltration decreases; runoff increases
  15. o The drop in elevation of a stream divided by the distance the water travels.
  16. p Original, old age streams downcut as the land gradually rose.
  17. q sea level falls; land rises
  18. r on the outer parts of the meander loops or bends
  19. s Calcium carbonate dissolving in soil water and groundwater