Rivers Flashcards

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1
Q

Where do rivers begin?

A

At their source

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2
Q

A rivers route from its source to the sea is called its …

A

Course

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3
Q

Where a river meets the sea is called it’s …

A

Mouth

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4
Q

What is a drainage basin?

A

The area of land that is drained by a river and its tributaries

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5
Q

What are two drainage basins usually separated by?

A

High land know as watershed

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6
Q

What are tributaries?

A

Small streams that join a river

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7
Q

What’s a levee?

A

Raised banks formed by the river on its floodplain

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8
Q

What’s an estuary?

A

Near the sea the part of the river that is effected by the tides

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9
Q

What is a meander?

A

Bends in the river

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10
Q

What’s a confluence

A

The meeting point of two rivers

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11
Q

What’s a floodplain?

A

Are covered in water in times of heavy rain

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12
Q

What is hydraulic action?

A

Is the force of fast flowing water that breaks up the bed and banks of the river

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13
Q

What is abrasion?

A

Stones carried by the river hit against the bed and banks

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14
Q

What is solution?

A

When river water dissolves the rocks over which it flows

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15
Q

What is attrition?

A

When stones roll along the bed or collide with each other

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16
Q

What’s traction?

A

Larger stones are rolled or dragged along river bed

17
Q

What is saltation

A

Lighter stones are hopped along the river bed

18
Q

What is Suspension

A

The smallest rock or soil grains are held up in the water making the water cloudy

19
Q

What is solution

A

Rock is dissolved in the water. Water may be clear but coloured

20
Q

What is alluvium

A

Is a fertile soil. Millions of farmers rely on river flooding to deposit alluvium on their fields eg the river Ganges India

21
Q

What are the three stages of a rivers course

A

Upper, middle,lower

22
Q

What happens in upper course

A

Steep, fast flowing river with little water, lots of erosion

23
Q

What happens in the middle course

A

River starts to flow down. More eroding, some deposition

24
Q

What happens in the lower course

A

River moving more slowly. Much more water. Mainly deposition, not much erosion

25
Q

What’s a water fall

A

A sudden drop in a rivers course

26
Q

What course are waterfalls found in

A

Upper course

27
Q

How do waterfalls happen

A

Soft rock has a layer of hard rock beside it