Waterfalls Flashcards

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1
Q

Waterfalls are found in the

A

Upper course of the river

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2
Q

How are water falls formed

A

The river flows over areas of hard rock and soft rock, eroding, soft rock, more quickly than hard rock through abrasion and hydraulic action
The hard rock sticks out, causing a step to form
Overtime, the step will get bigger and the soft rock at the bottom of the Now waterfall is a rooted to form a plunge pool
The soft rock will erode, deeper and backwards undercutting the hard rock
The hard rock above the plunge pool, collapses, and the waterfall moves by creating a gorge 

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3
Q

Plunge pool

A

Hard rock that has collapsed

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4
Q

Over hang

A

The hard rock hanging over as the soft rock has eroded

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5
Q

Gorge

A

When the waterfall moves back because the rock above the plunge pool has collapsed leaving steep sides behind

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6
Q

Under cutting

A

Soft rock being eroded

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7
Q

What happens in the middle stage of the river

A

The gradient starts to level and the river begins to meander

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8
Q

Meander

A

Bends in the river

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9
Q

Meanders are slower on the —- — -and quicker on the —-

A

Inside outside

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10
Q

Meanders can develop into

A

Ox bow lakes

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11
Q

Water is faster on the

A

Outside of the meander

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12
Q

On the inner curves water is

A

Slower

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13
Q

When a river meanders the outer bank is

A

Eroded

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14
Q

As a river meanders the inner bend

A

Deposits

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15
Q

Over time the outer bank

A

Wears away

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16
Q

Over time the inner bend

A

Moves in making a beach

17
Q

As the process continues and the meander grows it becomes more

A

Loopy

18
Q

Describe the inner bend of a meander

A

Deposition
Slip of slope or meander beach
Slower current

19
Q

Outside meander

A

Erosion
Faster current
River cliff

20
Q

When the river is really loopy and is the water level is high the river has enough energy to do what

A

Go straight across the loop

21
Q

What is this called bust through called

A

Meander cut off

22
Q

What does the river do now it’s broke threw

A

Sticks to its new route

23
Q

What is left after the river sticks to the river

A

Ox bow lake

24
Q

After a long time the ox bow lake

A

Silts up and dries out and becomes very fertile ground