Chapter 13 Quiz – Streams – Flashcards
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Which one of the following would cause stream rejuvenation?
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the land is uplifted
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________ is an abandoned, cutoff, meander loop that is now a lake.
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an oxbow
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Stream discharge is defined as the quantity of water flowing past a specific channel location per unit time.
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true
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A stream begins at an elevation of 200 meters and flows a distance of 400 kilometers to the ocean? What is the average gradient?
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0.5 m/km
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Rapids and waterfalls are characteristic of laterally cutting (meandering) streams.
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false
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Where is erosion concentrated along a meandering stream?
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on the outer parts of the meander loops or bends
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________ make up the suspended loads of most rivers and streams.
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silt and clay-sized, detrital grains
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All else being equal, a stream with a boulder-strewn bed would be more turbulent than one with a sandy bed.
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true
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A V-shaped valley and no floodplain indicate a youthful, downcutting stream.
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true
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Lateral cutting and deposition are important factors in floodplain development.
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true
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A ________ stream pattern is developed only on growing mountains like volcanoes or where the land surface is tectonically doming upward.
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radial
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After a meander is cut off, the gradient through the newly formed cutoff is steeper than the gradient along the abandoned meander loop.
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true
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Gradients usually decrease downstream in a major river system.
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true
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________ are characteristics of downcutting streams and a youthful stage of valley evolution.
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rapids and lots of whitewater
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A ________ stream pattern develops on lands underlain by tilted or folded, alternating hard and soft, sedimentary strata.
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trellis
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Many larger rivers in the Colorado Plateau region meander in deep, narrow canyons and have no floodplains. How could this happen?
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meandering streams became rejuvenated, starting to downcut as the land gradually rose
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How does urbanization (paving, etc.) affect runoff and infiltration in a small, previously forested, drainage basin?
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infiltration decreases; runoff increases
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The ________ river has the largest discharge of any in the world.
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Amazon
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Point bars are depositional features located along the outer portions of meander bends.
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false
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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 ________.
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distributaries
