Windblown Deposits

Collect the following: newspaper, dry sand in jar with lid, box lid, spoon, water, paper, and pencil. Place the box lid on the center of the paper. Remove the lid from the sand and place it inside the box lid near the center. Blow gently on the sand; increase the strength of your breath until sand is being thrown from the lid. Continue blowing for 5 to 10 seconds at this rate.

Examine the material in the paper by rubbing your finger over it. Do the same to the material trapped in the box lid. Which is finer? Why?

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