Build a baking soda and vinegar volcano.

Create a homemade solar oven.

Test water filtration methods using sand and charcoal.

Observe seed germination under different conditions.

Make a simple electric circuit with batteries and bulbs.

Investigate the effects of magnets on various materials.

Explore density with oil and water mixtures.

Study plant transpiration with plastic bags on leaves.

Design a parachute and test air resistance.

Measure the pH levels of common household liquids.