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27 Cards in this Set

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