1. Terraqua Columns - Sources and Standards

Sources
Bottle Biology contains everything you wanted to know about terraqua columns.

The Learner website has wonderful pictures of terraqua columns in progress as well as many extensions to try.

Standards
Grade Six
Ecology (Life Sciences)
5. Organisms in ecosystems exchange energy and nutrients among themselves and with the environment.

I think this activity is well written and can be used by any teacher. You could not have done a better job.