Landscapes

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					       Landscapes
 A landscape is a region on
Earth’s surface. (See p. 2 of
    your reference table)
     What are the three types of
           landscapes?
 Mountains

 Plateaus

 Plains
   What causes the formation of
          landscapes?
 Climate

      Bedrock
 Local

 Human Activities.
How do we determine what type of
        landscape it is?
 On   the basis of
 – Gradient
 – Elevation
 – Rock Structure
 Landscapes are divided into three major
   types
         mountains, plains and plateaus
                     Mountain
   Characteristics
    – High Elevation
    – Distorted Rock
      Structure
        Due to convergent
        plate movement,
        faults, folds and
        volcanic rock
                      Plateau
   Characteristics
    – High Elevation
    – Rock is not
      distorted
    – Formed by agents
      or erosion
                        Plain
   Characteristics
    – Low Elevation
    – Level Surface with
      very little change in
      slope
 Picture A represents a mountain
 Picture B represents a plateau

 Picture C represents a plain
Factors of Landscape Development
   Uplifting Forces
    – Originate beneath or within Earth’s lithosphere. They
      displace and form new rock material to raise the land.
   Leveling forces
    – Erosion and weathering the landscape will be lowered
   Impact Craters
    – The collision of meteorites, asteroids and comets has
      been a major contributor to landscapes.
   Climate
    – The rate of development and the characteristics of
      landscapes in an area are greatly influenced by
      temperature and moisture conditions.
              Arid Climate
 In arid climates, there is little vegetation
  to hold the sediments in place on steeper
  slopes or at the bases of the slopes so
  wind and running water can rapidly carry
  sediments away.
 This rapid removal of sediments causes
  many arid regions to have steep slopes
  and sharp, angular landscape features.
           Humid Climate
 In  humid climates, sediments on
  hillslopes and at the bases of
  hillslopes, are better held in place by
  vegetation.
 Areas of humid climates are
  characterized by the smooter and
  more rounded landscape features.
 Effects of Climate on Landscape
 Development (see p. 308 in your
       regent review book)
 Picture A represents a humid climate
 Picture B represents a dry, arid
  climate
         Drainage Patterns
 Over  time, a stream system achieves
  a particular drainage pattern to its
  network of stream channels and
  tributaries as determined by local
  geologic factors.
 Their shape or pattern develops in
  response to the local topography and
  subsurface geology
              Dendritic Pattern
   A dendritic drainage        What it looks like
    pattern is the most
    common form and
    looks like the
    branching pattern of
    tree roots.
   It develops in regions
    underlain by
    sedimentary rocks and
    lava flow with similar
    resistance to
    weathering.
              Trellis Drainage
   Trellis drainage            What it looks like
    patterns look similar
    to their namesake, the
    common garden
    trellis.
   Trellis drainage
    develops in folded
    topography like that
    found in the
    Appalachian
    Mountains of North
    America.
              Radial Drainage
   The radial drainage         What it looks like
    pattern develops
    around a central
    elevated point. This
    pattern is common to
    such conically shaped
    features as volcanoes.
    The tributary streams
    extend the headward
    reaches upslope
    toward the top of the
    volcano
          Annular Drainage
 Annular drainage is       What it looks like
  found in areas of
  domed structure
  with much
  difference in rock
  resistance
 Forms when layers
  of rock are uplifted
  into a dome or
  down-warped into
  a basin
Lab Activity #12, Landscapes, July
              28, 2010
 Pleasecomplete lab activity #12:
  Landscapes.
 When finished please complete
  – Questions 1-6 on page 304
  – Questions 7-18 on pages 309-310
  – Questions 19-25 on pages 313-314
     HW #12, July 28, 2010
 Please   complete
  – Questions 1-6 on page 304
  – Questions 7-18 on pages 309-310
  – Questions 19-25 on pages 313-314

				
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