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In this activity, learners discover that as the salinity of water increases, the density increases as well. Learners prove this by attempting to float fresh eggs in saltwater and freshwater.

In this activity (on page 14 of PDF), learners use a pan full of flour and some rocks to create a moonscape.

Learners build a simple solar oven from a shoebox, black construction paper, and aluminum foil. Over the course of a few hours, the oven heats up water enough to brew tea.

In this demonstration, learners compare the relative sizes and masses of scale models of the planets as represented by fruits and other foods.