Well, well.. I think I may have found what I can do for HOPE days. (that's our spring or fall session of group teaching with my homeschool group).
Anyways, it's rather a neat resource put out by the National Oceanic and Atmospheric Administration. Experiments, Learning, Explanation, Thought provoking.
I browsed through a great deal of it. Downloaded the entire activity book. I downloaded it as separate parts for ease of use. :) Found that most of it worked really well, but couldn't figure out the "game" that is linked on one of the pages. if someone else can.. LOVELY. :)