River valley Changes Flashcards

1
Q

what is a drainage basin?

A

an area of land where water from precipitation drain downhill into a body of water such as a river or ocean

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2
Q

what is the river source?

A

the start of the river usually in an upland area

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3
Q

what is the river mouth?

A

the end of the river where it meets the sea

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4
Q

what is a tributary?

A

a smaller stream or river which joins the main river

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5
Q

what is a confluence?

A

the point where a tributary meets the main river

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6
Q

what is a watershed?

A

an imaginary line showing the boundary of the drainage basin

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7
Q

what is the gradient like in the upper course?

A

it is very steep

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8
Q

what is the gradient like in the middle course?

A

it had a very gentle gradient

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9
Q

what is the gradient like in the lower course?

A

it has a very gentle gradient

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10
Q

what is the cross section in the upper course like?

A

it has a v shaped valley

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11
Q

what is the cross section in the middle course like?

A

it has a wider valley and flat floor

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12
Q

what is the cross section like in the lower course?

A

it has a very wide and flat valley

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13
Q

what is the river like in the upper course?

A

very narrow,shallow and turbulent

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14
Q

what is the river like in the middle course?

A

•the river is wider and deeper

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15
Q

what is the river like in the lower course?

A

•it is wide and deep

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16
Q

how much bed load is in the uppercourse?

A

it has large bed load like boulders and rocks

17
Q

how much load is found in the middle course?

A

it had smaller material in load

18
Q

how much load is found in the lower course?

A

it has mainly suspended load

19
Q

what processes occur in the upper course?

A

mostly erosion

20
Q

what processes occur in the middle course?

A

mostly erosion and deposition

21
Q

what processes occur in the lower course?

A

mostly deposition