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staff.gpschools.orgrothensEnviroFreshwater_20Ec

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					Characterize changes in a freshwater system,
     assuming NO human interference.
 The natural SUCCESSION from a lake to a
meadow and the process of Eutrophication.
Eutrophication-the natural aging of an aquatic system
     caused by the addition of nutrients over time.
 Young Lake  Old Lake  Marsh  Meadow  Forest




   Waters change from clear with little plant and
animal life to murky with much plant and animal life.

   Over much time, the body of water eventually
         fills in to become solid ground.
Changes to a stream’s gradient and valley shape
over geologic time are likely to occur as follows:

                               Young Streams
                                have rapids,
                               waterfalls, and
                               generally fall a
                              greater elevation
                              over their course.




 Younger streams also
      have more
  “V” shaped valleys!
Changes to a stream’s gradient and valley shape
over geologic time are likely to occur as follows:

                                    Old Streams
                                    usually have
                                 fewer rapids and
                                waterfalls because
                                  they drop less in
                                   elevation over
                                    their course.




  Old Streams tend to
     have a more
  “U” shaped valley
Changes to a stream’s gradient and valley shape
    over geologic time are likely to occur:

                                Make note of the
                                  following:

                                  Importance of
                                     Rivers

                                 How they form

                                   How rivers
                                 change as they
                                 move downhill

                                    Erosion &
                                Sediment Deposits
The formation and evolution of sand dunes

  Three Requirements
         1. Source material:
     rock (inland), coral (marine)



     2. Wind and drier conditions


           3. Obstruction:
     wind shadow deposits sand
   Sand Dune Formation

                                      Fourth dune


                         Third dune
                Second
                dune
        First
Wind    dune

Water

   Predune
                  Interdunal areas
             Sand Dune Formation:
        Linear       Parabolic        Perched




http://techalive.mtu.edu/meec/module09/DuneMechanism.html
Sand Dune Formation

                      Make note of the
                        following:

                      Characteristics of
                      Plants that live in
                           dunes

                      How plants help
                      sustain the dune

                        Effects these
                       plants have on
                        other plants

				
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posted:10/9/2012
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