Teaching our children about forces that can change the Earth's surface today. After watching a PowerPoint of before and after land forms, Mrs. Ruark unveiled the lab. They discussed the rocks, sand, clay and humus that they saw on the slanted board. Then children were off to their journals to draw the "before" landscape, Finally they predicted what they thought would happen if we added air and/or water.
We started with a little air through a straw. The children noticed that the sand moved around just a little as the child blew a little stream of air.
Then finally it was a flash flood!
And the children watched as the water moved much of the sand, clay and even rocks. They also decided that the grass stayed put because the roots helped to keep the humus in place.
After an excited discussion, the children went back to their journals to write the conclusion to the experiment, observing the air and water can move soil.