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27 Cards in this Set
- Front
- Back
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give three sources of rivers
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spring, lake, heavy rainfall and melting of glaciers
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when a river cuts downward into the ground it is called...
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vertical erosion
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what two things are needed for a waterfall to form?
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hard and soft rocks
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what are spurs?
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sides of hills or mountains which jot out to form the path of rivers
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what are interlocking spurs
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sides of hill or mountains jotting out on either side of a mountain
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give one feature formed in the youthful stage and explain how it is formed
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potholes-the water of a fast flowing river swirls if the bed is uneven. The pebbles carried by a swirling river cut circular depressions in the river bed which gradually deepen to form pot holes
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give another feature formed in the youthful stage
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waterfalls- formed from the presence of hard and soft rocks. The hard rocks erode the soft rocks resulting in the water descending vertically to form a waterfall
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what are distributaries
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smaller channels or streams which break off from the main river
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give one feature formed in the mature stage of a river
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bluff- this is formed when the end of a spur is cut off by erosion
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what are tributaries
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smaller rivers which flow into the main one
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The area of land that is adjacent to the lower/old course is called the...
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flood plain
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How are levees formed?
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when the river floods most deposition takes palce on and near the banks as the force of the water is checked as it spreads out over the floodplain
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give three conditions necessary for a delta to form
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river must be large enough to effect erosion, river must have a large load and the sea must be calm
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where is the convex river bank
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on the inside of a river
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where is the concave river bank
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on the outside of a river
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give another name for the youthful stage of a river
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torrent stage or upper course
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interlocking spurs are caused by what?
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erosion
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what is river capture
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this is the process by which a strong subsequent river(tributary) takes the water from weak consequent river (main)
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the place at which two rivers meet is called a...
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deferred junction
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when the river water mixes with sea water it is called...
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brackish water
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which type of delta has coarse sediments and a great number of distributaries
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arcuate
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describe the bird's foot delta
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it is shaped like a birds foot and has few sediments and a few distributaries
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which delta develops in an estuary(sumberged mouth of river)
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estuarine delta
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which drainage pattern has a unifomed rock structure
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dendritic
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describe the trellis drainage pattern
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it has alternate belts of hard and soft rocks and the tributaries join the main river at right angles
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the radial drainage pattern is associated with volcanic mountains. What influences this type of pattern
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relief(shape of land)
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what influences both trellis and dendritic drainage patterns
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rock structure
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