Slicker than a Yes album. | Gotta get in on this (darn geology classes) Rich is right. "Rock" is a general term for multi-crystal formation (most of what you see) made up of different minerals (made from 1 type of chemical composition)
Boulder is anything larger than your head, cobble is fist size to head size, pebble, granule, sand, silt, clay. Lot's of sub-classes. Read all about it here.
http://en.wikipedia.org/wiki/Particle_size |
OK, Here are the Rocks......
