Cliff wrote:

Try this:
Pumice, obsidian, and scoria are glasses:
True [X]
False [ ]

Cliff:

That didn't hurt at all. Now your turn.

Pumice, obsidian, and scoria are amorphous (non-crystalline or
"glassy"), igneous rock.

True [ ]
False [ ]


--
BottleBob
http://home.earthlink.net/~bottlbob