Geography, rivers

• Abrasion occurs when rocks and boulders carried by the river wear down the riverbed and banks.
• The river Nile is the longest river in Africa.
• Source of a river


  The starting point of a river, where it begins to flow
• Mouth of a river


  The end point of a river, where it meets another body of water
• Meandering River


  Characterized by frequent bends and curves, often with a meandering course
• River Mouth


  Where a river meets the ocean, creating a network of distributaries and wetlands
• Tidal Range


  The difference between high and low tide
• Source


  The beginning of a river, often located at a high elevation.
• Mouth


  The end of a river, where it meets another waterbody, such as an ocean or lake.
• Course


  The path a river follows as it flows from its source to its mouth.
• Channel


  The main path of a river, which can be narrow and deep or wide and shallow.
• Reasons for costal damage?


  Waves-they slowly crumble away at the crack in a cliff

  Weather-tsunami, hurricanes

  Man-made structures
• Gryome


  Man-made
• Beach


  Rocks in the sea come onto the land making sand
• Stream


  Rain goes onto hill, slides down and washes away mud to become a stream
• 3 types of erosion?


  Hydrolic action, solution, abrasion, attrition
• 3 types of weathering?


  Physical, chemical, biological
• What is hydrolic action?


  It’s where water expands in a cliff crack and causes it to expand
• What is solution?


  When rocks dissolve in sea water or in a river making the water dirtier
• What is abrasion?


  Material being carried which scrapes river beds wearing them down
• What is attrition?


  Rocks bump against each other to make them smoother
• What is physical weathering?


  Heating and cooling, water, wind and ice expansion
• What is chemical weathering?


  Substances in the air and rain
• What is biological weathering?


  Done by animals and plants