Earth’s Land

1
Earths Land

• The impact of waves, wind, water and ice on the
  earths land is what causes erosion.

ci.uofl.edu/tom/photos/ Hawaii/oahu-waves.jpg
2
How does erosion, with weathering, shape the
land?

• What is erosion?

http//www.soton.ac.uk/imw/jpg/2AB-steps-erosion.
jpg

• Erosion is the process by which rock material is
  broken down and carried from one place to another
  by moving water, wind, or moving ice.

• Water causes more erosion on Earth than wind and
  moving ice combined.

• Weathering is one way that rocks are broken into
  smaller pieces.

3
Sediments on the move

• Materials carried by moving water are sediments.

• If you sneeze into a pile of dust the little
  particles fly everywhere, but if you sneeze into
  a pile of rocks, they will stay put. It takes
  more force than a sneeze to move those rocks.
  Winds and water can have enough force to move
  rocks.

www.mississippi-river.com/ umrcc/img/sediment.jpg
4
How sediments move?

• Very small pieces of sediment like mud and clay
  are picked up very easily by moving wind and
  water. But they can settle to the bottom of calm
  lakes or to the ground when the air or water
  stops moving.

• Larger pieces of sediment can be carried in a
  stronger current, like fast moving water.
  Sediment that can sink to the bottom in a fast
  moving river must be very large and heavy.

5
How do the actions of wind and water change
shorelines?

• Waves are driven onto the shore by wind.

• Along rocky shorelines, sand and rocks carried by
  the waves break down the rocks and wear them away.

• This method creates the sand, but also removes it
  and deposits it in far away place.

sustainableresources.pir.sa.gov.au/ pages/land...
6
How does wind wear down and build up the land?

• Wind erodes the Earths surface by removing sand
  and silt from one place to another. (have we
  heard this before?)

• The sediments that are carried weather the
  Earths surface.

www.feedsoft.clara.co.uk/. ../pics/w_wind2.jpg
7
How do glaciers change the land over which they
move?

• Glaciers do move, gravity is the maid force that
  makes valley glaciers move.

• The surface beneath the glacier is changed by the
  weight of the ice and material carried.

www.homepage.montana.edu/.../ space1/maritime.JPG
8
Why is soil important, and how can it be
conserved?

• Soil is the loose rock that covers the Earths
  land surface.

• One way to conserve the soil is to leave plants
  growing where they are.

www.area.fi.cnr.it/ iges/terraces3.jpg
9
Fun Facts

• The Pacific Oceans shoreline erodes at a rate of
  3 feet per year.

10
Works Sited

• California Department of Education
• http//www.cde.ca.gov/be/st/ss/scgrade4.asp
• Standards
• Dennis Images
• www.env.duke.edu/psds/ images/Dennis/erosion.jpg
• Erosion
• Sevilleta
• sevilleta.unm.edu/.../ biomes/sand-dunes.gif
• Sand Dunes
• Tomasz Cholewo
• ci.uofl.edu/tom/photos/ Hawaii/oahu-waves.jpg
• Waves
• Windows to the Universe
• http//www.windows.ucar.edu/tour/link/windows.htm
  leduelem
• Information on Erosion
• Alum Bay
• http//www.soton.ac.uk/imw/jpg/2AB-steps-erosion.
  jpg
• Erosion Picture
• Mississippi River Conservation

• Land Conservation
• sustainableresources.pir.sa.gov.au/ pages/land...
• Wind Erosion
• Buxton Homepage
• www.feedsoft.clara.co.uk/.../ w_photos.htm
• Wind Damage
• Montana Homepage
• www.homepage.montana.edu/.../ space1/maritime.JPG
• Valley Glacier
• Soil Center
• www.area.fi.cnr.it/ iges/terraces3.jpg
• Soil Conservation