The drop in stream elevation per unit distance is

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50) The drop in stream elevation per unit distance is known as A) discharge. B) base level. C) gradient. D) aspect. E) slope. Answer:
C
11 51) A graphic depiction of a streams gradient from its headwaters to mouth is called a(n)
E 52) Which of the following is correct of the longitudinal profile of most rivers?
C 53) The process whereby streams lengthen their channels upstream is called
A 54) Stream piracy refers to A) the legal process by which a state secures rights to the waters of a river basin. B) the merging of two streams flowing in the same valley. C) capturing the headwater regions of another stream by an eroding rill in another system. D) the illegal withdrawal of water from a river. E) upstream erosion leading the to the lengthening of the channel. Answer:
C 55) Base level refers to
B 56) The ultimate base level is
C
12 57) Which of the following may act as a local base level?
A 58) A(n) ________ stream is one in which the channel slope has adjusted so that stream velocity is just enough to transport the sediment load. A) graded B) ungraded C) equilibrium D) disequilibrium Answer:
A 59) A(n) ________ is a stream which maintains an equilibrium between the processes of erosion and deposition and, therefore degradation and aggradation.
A 60) An interruption in a stream's graded profile of equilibrium is called a
E

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