FossWeb Pebbles, Sand and Silt Module:

Ask a Geologist
You can e-mail any questions you have about earth science to geologists at this site, and you can browse through their frequently asked questions.

Sand Castle Central
Check out their tips and tricks to building great sand castles, and see the incredible photos of sand-sculpture competitions.

Sands of the World
This highly successful interactive project was initiated by a fourth-grade teacher in Rhode Island involved in a multiple-intelligences program. Students in grades 3–12 from around the world send in samples of sand for the class to analyze and photograph under microscopes. Check out the sand sampler for a collection of beautiful photos, or listen to the sounds of "singing sand."

J. C. Duff Sand & Gravel Limited
An exciting virtual tour of a gravel pit, from the comfort of your computer desktop.