Questions about water, weather, geology, astronomy, and the scientific process make up this Jeopardy game. It is a pretty well-rounded set of slides, although you may want to be aware that a few of the questions are specific to the state...

Students explore water density and design a hydrometer to measure density. This activity is part of Ocean World's home site and excellent resources and links are provided.

Pupils measure salt content in water. They determine salt content of four samples using a hydrometer.