Water on Earth

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River Civilizations

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Environmental Pollution

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Water on Earth

How Rivers affect people

Negative

Flooding

Positive

Means of transport

Production of hydroelectric power

Source of drinking water and food

Recreation and tourism

Water supply for industry

Fertile soil for farming

Water supply for farming

Features formed by Rivers

Deltas

Formed where layers of sediment are deposited at the river mouth over time

Floodplains

A low-laying land that becomes flooded when a river overflows its banks

Meanders

A bend or curve in a river

Waterfalls

A vertical flow of fast-moving water falling from a great height

Valleys

A low area between hills or mountains

The Drainage Basin

Watershed

the area that is drained by a river and its tributaries is called the drainage basin

Drainage Basin

he boundary of a drainage basin is marked by the tops of the surrounding highland

The River system

River mouth

The end of the river wehn it flows into a lake or sea

Tributaries

the streams and rivers that join a main river

River source

The place at which a river begins

The Hydrologic Cycle

4. Runoff / Groundwater

3. Rainfall

2. Condensation

1. Evaporation / Transpiration

Also known as water cycle

Distribution of Water

3% fresh water

1% found in streams/lakes/rivers

29% found underground

70% is frozen

97% salt water