Rock Cycle - Rocks (4B)
Post Lab 

   
OBJECTIVES:
  • Developing a story about how rocks become round.
  • Using information to construct a story on rocks.
VOCABULARY:
  • angular
  • eroded
  • movement
  • round
  • transport
MATERIALS:
  • Internet

Students develop language arts skills using sand as a story line.

BACKGROUND:

People, young and old, like to feel shiny, smooth rocks. Many do not even realize that these types of rocks have endured erosion, possibly as the rocks tossed and turned down a river's path. Abrasion by glaciers and wind also results in a smooth surface on a rock.

Throughout history, civilizations have used rocks and minerals in sacred ceremonies. People even have spent money to purchase "pet rocks." Rocks and minerals have characteristics that lure people to them, including their strength, their smoothness, and their beauty.

Rocks and minerals can become the storytellerís "liar stone." The rock or mineral can neither confirm nor deny the tale. This is what makes just one rock, a perfect way for students to communicate.

PROCEDURE:
  1. Instruct students to look on the Internet for information that show a "fun" way to present rocks. The following web sites on sand castles can help students realize that people around the world can enjoy sand without knowing all the science behind them. However, knowing the science makes it more interesting.

    http://www.netaxs.com/~sparky/sand.html
    Center for Sand site includes geology, biology, and art of sand.

    www.sandcastlecentral.com/tips/index.html
    Sand castles for beginners gives information on how to build an award winning sand castle.

     

  2. Instruct the students to study the worksheet and use their imagination to decide how Billy can determine why the rocks became round. Some students may want to be more scientific, but others may want to develop a fictional story line. The story below is an example. Remind students that "Billy" could refer to a boy, girl, or even a goat.

    Billy found pebbles that were along a river. The river's waters carried the rocks along the bottom of the river bed. The pebbles were eroded by abrasion. The longer a pebble stays in the river bed, the more rounded it will become. The more angular a pebble is, reflects that it has not been moving for very long. Billy found the two different types of rocks together (one very old, eroded and well rounded, the other very angular and new) because the river can erode new rock anywhere on its journey.

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