Lesson Plan

Erosion: Washing Away the Earth

Tors at Serpentine Hot Springs are shaped by the forces of erosion

Tors at Serpentine Hot Springs are shaped by the forces of erosion

NPS Photo - Andrea Willingham

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Grade Level:
Fourth Grade-Seventh Grade
Subject:
Climate, Climate Change, Earth Science, Environment, Geology, Hydrology, Meteorology
Duration:
45 minutes (plus 2 hour optional film)
Group Size:
Up to 12 (2-4 breakout groups)
National/State Standards:
Alaska State Standards for science: 4SD2.1,  5SD2.1,  7SD2.1, 7SE2.2
Keywords:
climate change, erosion, water, wind

Overview

Erosion can be a major issue.  It is caused by a number of factors, both manmade and natural.  The effects of erosion are very evident on Arctic coastal villages that are experiencing storm surges and no longer have the added protection of longer lasting sea ice. Research indicates that both the storm surges and lost of sea ice are the result of climate change.

Objective(s)

Students will be able to describe erosion. They will also be able to list at least three causes of erosion.

 

Background

Start the lesson by asking students to tell you what erosion is.   Erosion is the displacement of solids (soil, mud, rock and other particles) by the agents of wind, water, ice, or living organisms, or by down-slope movement in response to gravity. (New World Encyclopedia)

Show students the short video of an Alaskan coastal area eroding at: http://dotearth.blogs.nytimes.com/2008/09/25/video-alaskas-eroding-arctic-coast/. Ask them what is happening and why.

If time permits, take the students to the library or computer lab to research different causes of erosion and to find images of Alaskan coastal villages that have been affected by erosion. You may want to assign different topics to different students (groups) and then have them share (present) they findings to the rest of the class.

Emphasize to them that erosion is the wearing away of a substance. It can happen over a long period of time or it can be quick. The soil around a river is susceptible to gradual erosion. When it storms or blows, then erosion may happen in a quicker fashion. Highlight the fact that erosion can be caused by wind, rain, water, ice and sea. Tell them that today they are going to perform an experiment to evaluate how much the Earth can erode.

Materials

  1. Two large disposable aluminum lasagna pans
  2. Natural soil from outside 
  3. A watering can or bucket of water
  4. A magnifying glass
  5. Two or three books or wooden boards about 1/2-inch thick each
  6. A pair of pointy scissors or the needle of a drawing compass
  7. A small portable desk fan
  8. A small scale to measure how much dirt has eroded
  9. A small shovel or garden trowel to scoop the dirt
  10.  The Last Days of Shishmaref Video

Procedure

Assessment

  1. Review erosion. Have the students define it.
  2. Have the students list the different kinds of erosion.
  3. Have the students list various causes of erosion and how it negatively affects their lives.
  4. Conclude by having the student's list things that they can do to help combat erosion.

Additional Resources

  1. http://en.wikipedia.org/wiki/Erosion#Coastal_erosion 
  2. http://www.newworldencyclopedia.org/entry/Erosion 
  3. http://dotearth.blogs.nytimes.com/2008/09/25/video-alaskas-eroding-arctic-coast/ 
  4. http://www.cakex.org/case-studies/1588

Vocabulary

Erosion
Storm surge
Sea Ice