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Rivers and the Water Cycle

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Rivers and the Water Cycle The Water Cycle The Water Cycle Where do rivers start? Most rivers start in the mountains because lots of rain falls there. – PowerPoint PPT presentation

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Title: Rivers and the Water Cycle


1
Rivers and the Water Cycle
2
The Water Cycle
3
The Water Cycle
4
Where do rivers start?
  • Most rivers start in the mountains because lots
    of rain falls there.
  • Some rivers start as springs.
  • Others start in marshy areas.
  • The place where a river starts is called its
    source.

5
Where do rivers flow?
  • The beginning of a river is usually called a
    stream.
  • As streams flow downhill they meet with other
    streams to form larger rivers.
  • Rivers flow downhill to the sea or a lake.
  • This is because of a force called gravity.

6
The upper course
  • In its upper course the river flows quickly.
  • You get waterfalls.
  • It wears away the rock around it and cuts a
    V-shaped valley.
  • This is called erosion.
  • The force of the water can move stones, pebbles
    and soil
  • .and sometimes even boulders.

7
Reservoirs
  • Dams are often built across rivers to make man
    made lakes called reservoirs.
  • The water from reservoirs is pumped into peoples
    homes and to factories.

8
The middle course
  • As the river flows downhill the valley becomes
    wider.
  • It flows more slowly.
  • Settlements grow on the banks of a river.

9
The lower course
  • As the land becomes flatter the river meanders
    and often floods.
  • Floodplains are usually very fertile, though they
    are often marshy.

10
Floods
  • Floods can cause tremendous damage to the land
    and buildings
  • People often lose their lives in floods.

11
Industry
  • Factories are often located near rivers.
  • This factory needs a lot of water for its cooling
    towers.

12
The lower course
  • As a river approached the sea, it is wide and
    flows through flat land.
  • Ships can navigate quite far up wide rivers.
  • The ships could carry passengers or cargo.

13
The estuary
  • You often get mudflats near the mouth of the
    river.
  • Some plants grow well on the mudflats and they
    often attract wildlife.
  • People often sail their boats in these estuaries.

14
The mouth of the river
  • At the river mouth there may be harbours and or
    docks.
  • These may be for fishing boats, cargo boats or
    ferries. Anchoring in the river means the boats
    are safe from rough seas.
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