Pour 1 cup of tap water into a small, clear measuring cup. Gently drop an egg into the water. The egg should sink to the bottom. Add 1 teaspoon of salt to the water and gently stir until mixed. Continue adding 1 teaspoon of salt at a time and stirring until the egg rises to the surface. Record the results. This experiment shows the property of density. As the salt was added to the water, the water's density increased. Once the density of the water was greater than that of the egg, the egg began to float.
Make a calendar-type grid on black construction paper with white chalk. Mark the date in each box and label the name of the month on top. Observe the phase of the moon every night for a month. Slice 16 marshmallows in half and put them in a storage container. Observe the moon every night and then bite a marshmallow piece so that the remaining shape looks like the moon phase for that night. Glue the marshmallow piece onto the calendar grid for the appropriate day. Continue this procedure until every day on the calendar has been observed. This project teaches the stages of the moon.
Visit a local park, forest or bushy knoll. Place large white tube socks over your shoes and go for a walk. When you're done, carefully remove and store any stickers or other seeds that have attached to your socks. Use a magnifying lens to observe the seeds closely. Draw pictures of the seeds and try to identify the similarities and differences in the way they attach to their host. This experiment shows one of the several ways that plants disperse in their environment.
Attach one end of a 5-yard piece of fishing line to a tree or post. Place the fishing line through a beverage straw. Inflate a balloon fully and measure its diameter at its widest point. Tape the balloon to the straw with masking tape so that the open end will propel the balloon along the fishing line when released. Hold the fishing line taut and level, then release the balloon. Have an assistant mark where the balloon stopped. Repeat the experiment, vary how fully the balloon is inflated. This experiment demonstrates concepts in aerodynamics.