Investigating the effects of different liquids on plant growth: Materials needed: Several small potted plants, water, milk, juice, and soda.

Investigating the effects of temperature on the rate of ice melting: Materials needed: Ice cubes, a thermometer, and different temperature environments (e.g., room temperature, refrigerator, freezer).

Investigating the effects of different surfaces on the distance a toy car can travel: Materials needed: Toy cars, different surfaces (e.g., carpet, tile, sandpaper), measuring tape.

Investigating the effects of different types of light on plant growth: Materials needed: Several small potted plants, different types of light bulbs (e.g., incandescent, fluorescent, LED), water.

Investigating the effects of different types of magnets on the strength of attraction: Materials needed: Different types of magnets (e.g., bar magnets, horseshoe magnets, ring magnets), various objects to test for attraction (e.g., paperclips, coins).

Investigating the effects of different types of soil on plant growth: Materials needed: Several small potted plants, different types of soil (e.g., sand, clay, potting soil), water.

Investigating the effects of different types of paper on the speed of paper airplanes: Materials needed: Different types of paper (e.g., construction paper, printer paper, tissue paper), ruler or measuring tape.