Describe how rocks can be classified according to their physical characteristics SPI 0307.7.2

Links verified 12/26/2014

1. Pebbles, Sand, and Silt - find out how earth materials are used all around us
2. Rocks and Minerals - from The Franklin Institute
3. Rocks and Soils - perform virtual experiments at this BBC interactive site
4. Sand - This web site is all about sand. It is a place where you can learn about sand, see a variety of different kinds of sand, and look at sands from different places around the world.
5. Sands of the World - an interactive earth science project
6. Soil Science and Worm Composting - lesson plan
7. Soil Science Basics - links to other resources (some links are dead)

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