In this experiment, students will create their own version of coquina, a sedimentary rock thatâs formed by seashells and sand, cemented by seawater minerals.

The objective of this science project was to build a model of a volcano and observe reaction between different substances, including baking soda and vinegar.

What chromosome combinations determine a fetus gender? Use probability to think about whether a sperm and ovum will create a male or female in this project.

The objective this science fair project is to determine whether a bigger bag will allow a homemade hot air balloon to fly higher than smaller bag.

This science fair project will help students learn about non-vascular plants, such as mosses.

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

This science fair project idea explores whether boiling and freezing water will have an effect on how much it weighs.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

In this CD hovercraft science project, students will construct their own DIY hovercraft.

Show your child how to construct a homemade thermometer. It's hands-on fun and a great way to learn about this important instrument!

This science fair project idea produces varying pitches of sound.

After completing this fun science project, your child will have a better understanding of plants, and they may even develop a green thumb in the process!

Find out whether packaged seeds actually do expire in this new science fair project idea.

Learners hypothesize about and experiment with soil erosion in this hands-on activity.

In this experiment you observe and determine how well your cat uses his whiskers to navigate through a maze.

Get your sense of humor ready for this fun science experiment that demonstrates the fundamental physics of air pressure.

Help your kindergartener identify and sort eight different kinds of common seeds on this "seed wheel" plate you can use all growing season.

This project is a vivid, concrete introduction to the basic but important idea that plants need sunlight and water to grow.

In this science fair project, students create their own miniature salt flats at home.

Marshmallows are made of sugar, water, and air pockets. Since the marshmallow is flexible, will air pressure cause it to expand when heated in a microwave?

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.

This activity will introduce your child to the four different components of blood and give him a fun way to visualize its properties.

Explore if planting seeds in a certain direction will affect how fast it germinates.

Magic, science, or household cleanser? Let your second grader decide with this practical, nontoxic chemistry experiment with acids and bases.

Science fair project which examines the relationship between frequency of spider web vibration and spider's response time.

This activity is a great way to teach kids that, to find examples of science in action, they donât need to look any further than their own backyard.

In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

In this science fair project, students will create a model of a shoreline, observe erosion and examine how jetties prevent erosion.

Using a toy race car kids create a visual model of the Doppler Effect.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.