Rivers

• What is a River?


  A large natural stream of flowing water within a channel.
• What is a tributary?


  A tributary is a little stream joined to the actual river.
• What is a source?

  The beginning of the river.
• What is the mouth?


  where the river meets the sea.
• Catchment area - is an area drained by a major river and its tributaries
• What is a water shed?

  A line of high land that separates the headwaters of different river drainage systems.
• what are the three main functions of a river?

  Erosion

  Transportation

  Deposition
• The four subjects under the subject Erosion?

  Solution

  Hydraulic Action

  Attrition

  Corrasion or Abrasion
• Solution- minerals from rocks dissolve in water and are carried along the river
• Hydraulic Action - when water gets into the river channel pressure builds up within the crack and when this pressure is released rocks slowly break apart.
• Attrition - This is when materials are pushed along the riverbed causing fragments of the riverbed to be broken up.
• Deposition - where the river can't carry its load no more due to low energy.
• What are the stages of a river?

  Young

  Middle

  Old
• Saltation - Materials move along the river in a hopping motion along the riverbed.
• Traction - Heavier material such as gravel and pebbles, roll, slide or are dragged along the riverbed.
• Suspension - Very fine materials, such as clay and sediment are transported in suspension in the body of the river water.