Soil Layers. We used marshmallows for the bedrock, because they are chunkier. Cheerios served as our subsoil. The children left some whole and crumbled some near the top of the layer. They used chocolate rice crispies for the topsoil and mixed some mini m in for the humus. They topped it off with gummi worms! http://mrsfeinmansclass.blogspot.com/2011/10/soil-layers.html
Soil Layers in a Cup
This visual example of erosion would help students understand how human activities can affect the landscape. One bottle could represent an untouched forest, another could represent an area with houses built, and another bottle could show land cleared for farming. The students would be able to see how humans can negatively impact Earth's natural processes.
This is an erosion experiment done comparing which type of natural erosion occurs the quickest: rain, glacier melting, or wind. This would be a great activity that could be done in class when talking about natural types of erosion. The students could postulate which they think would work the fastest, do the experiment, and write up their results which we could talk about as class.