What you will    Learn1. Describe the   hydrological cycle.2. Describe the river   system.
The hydrological     cycle  Continuous  movement of water  is called the  hydrological cycle.
Rivers play an important role in thehydrologic cycle. Study the figurebelow.                          Rainfall            ...
EvaporationThe sun’s heatcauses water toevaporate. Waterchanges into watervapour.
TranspirationPlants give outwater vapourthrough theirleaves.
CondensationWarm air cools as itrises. Water vapourchanges into waterdroplets. Small waterdroplets combine toform bigger w...
RainfallWater falls as rainor snow if the air iscold enough
RunoffWater that is left onground surfaceflows over the landas surface runoff.Water flows fromhighlands to
GroundwaterWater that seepsinto the ground maybe absorbed byplants or flow intorivers, lakes or seas.
Importance of river inthe hydrological cycle   Rivers are an   important part of   the hydrological   cycle as they   cont...
River systemRiver is a body ofwater flowing in achannel.Aided by gravity,rivers always fallsfrom a higher point to
River source                 Tributaries                                                        River mouthUpper course   ...
Characteristics Along a River —  Channel and River Valley            Upper      Middle        Lower            Course     ...
Drainage Basin &    Watershed  Read the definitionof a watershed and adrainage basin in yourtextbook.
Now study the picture belowcarefully. Where would youfind, in the picture, the:• ‘drainage basin’?• ‘watershed’?
Drainage Basin  Drainage basin isthe land area drainedby the main river andits tributaries.
Watershed The edgeof thedrainagebasin ischaracterizedby thehighest pointof land
Working Time!  WB WS 6.1
Chapter 6 Rivers 1
Chapter 6 Rivers 1
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Chapter 6 Rivers 1

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Chapter 6 Rivers 1

  1. 1. What you will Learn1. Describe the hydrological cycle.2. Describe the river system.
  2. 2. The hydrological cycle Continuous movement of water is called the hydrological cycle.
  3. 3. Rivers play an important role in thehydrologic cycle. Study the figurebelow. Rainfall Condensation Transpiration Runoff Evaporation Groundwater What are the different processes in the hydrologic cycle? What role does the
  4. 4. EvaporationThe sun’s heatcauses water toevaporate. Waterchanges into watervapour.
  5. 5. TranspirationPlants give outwater vapourthrough theirleaves.
  6. 6. CondensationWarm air cools as itrises. Water vapourchanges into waterdroplets. Small waterdroplets combine toform bigger waterdroplets. Million of
  7. 7. RainfallWater falls as rainor snow if the air iscold enough
  8. 8. RunoffWater that is left onground surfaceflows over the landas surface runoff.Water flows fromhighlands to
  9. 9. GroundwaterWater that seepsinto the ground maybe absorbed byplants or flow intorivers, lakes or seas.
  10. 10. Importance of river inthe hydrological cycle Rivers are an important part of the hydrological cycle as they contain water that is found on the Earth’s
  11. 11. River systemRiver is a body ofwater flowing in achannel.Aided by gravity,rivers always fallsfrom a higher point to
  12. 12. River source Tributaries River mouthUpper course Middle course Lower course
  13. 13. Characteristics Along a River — Channel and River Valley Upper Middle Lower Course Course CourseChannel Narrow, Wider, Widest, shallow deeper deepestGradient Steep Less steep Almost flatVolume of water Low Higher Highest
  14. 14. Drainage Basin & Watershed Read the definitionof a watershed and adrainage basin in yourtextbook.
  15. 15. Now study the picture belowcarefully. Where would youfind, in the picture, the:• ‘drainage basin’?• ‘watershed’?
  16. 16. Drainage Basin Drainage basin isthe land area drainedby the main river andits tributaries.
  17. 17. Watershed The edgeof thedrainagebasin ischaracterizedby thehighest pointof land
  18. 18. Working Time! WB WS 6.1
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