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What

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What s a landform? Physical shapes of the land such as hillsides, cliffs and marshes are some examples. Erosion Erosion Erosion What s the difference between ... – PowerPoint PPT presentation

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Title: What


1
Whats a landform?
  • Physical shapes of the land such as hillsides,
    cliffs and marshes are some examples.

2
Erosion
3
Erosion
4
Erosion
5
Whats the difference between weathering
erosion?
  • Weathering can take place in various manners
  • Physical or Mechanical rocks breaking due to
    wind, rain, ice (natural forces) or human
    activity
  • Burrowing animals or plant roots wedging rock
    apart
  • Chemical rocks change due to different chemical
    reactions such as mild acid from rain
    deteriorates rocks, paint, or building surfaces
    or water iron oxidize to become rust.

6
Whats the difference between weathering
erosion?
  • Weathering rocks particles stay in one place
  • Erosion process of breaking rocks into
    particles (smaller pieces) and having them move
    (by wind or water or ice)

7
Deposition
  • Deposition is when those particles or rocks have
    been moved and are then left in another place!

8
Earth Processes
  • Weathering, Erosion Deposition have been
    occurring for billions of years. (These are
    known as Earth processes.)
  • Natural factors affect the rate of these
    processes
  • Natural factors are wind, water (rain), ice
    (glaciers)
  • Human activities can accelerate the Earth
    processes. Construction farming are 2
    activities that cause the most erosion. These
    activities break apart rocks. Soil plant roots
    hold land in place. Sediments can also carry
    pollution and toxic materials (pesticides) to new
    areas.

9
Positive/Negative of Erosion
  • Positive effects of erosion slow steady water
    erosion creates lakes, rivers, hills, canyons,
    fertile plains.
  • Negative effects of erosion slow steady water
    erosion can cause collapse of roads buildings.

10
Positive /Negative - Deposition
  • Positive effects of deposition adds nutrients
    to soil creating fertile floodplains, building
    landforms such as deltas, forms rocks after long
    periods of time like sandstone.
  • Negative effects of deposition building up
    filling in rivers, lakes, wetlands, covering
    habitat areas needed by fish animals, clogs
    pipes which provide water to cities towns, also
    causes waterways to become shallow

11
Topographical Maps
  • Topographical maps show the contour or elevation
    of the Earths surface.
  • A contour line is an imaginary line on the
    Earths surface connecting points of the same
    elevation.
  • A contour interval shows the differences in
    elevation between adjacent contour lines.
  • When there is a lot of space between contour
    lines, the land is relatively flat. When the
    contour lines begin to move closer together, the
    terrain or area is steep as indicative of
    mountains or hills.
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