Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

Science fair project that examines what causes thunder and why a thunderclap sounds so loud. How is lightening related to the creation of sound waves?

Take a closer look at your furry friend (or the furry friend of a neighbor -- with permission) to discover if communication exists between cats and humans.

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.

Can a horse lead itself to the carrot? Train your horse with carrots and boxes and test horse memory in this fun zoology science fair project.

What is a wedge? Kids find out by experimenting with different wedges in this simple science fair project idea.

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

This science fair project idea determines if crystals will absorb food dye and if colors will mix by the process of diffusion.

Learn about this simple machine and make a pulley of your own to use for fun science trials.

In this science fair project, you'll make a "ghost" appear in a test tube, and learn about what happens when hot water and cold water interact.

It's rhyme time! With this science fair project idea, your child will find out which words can be considered easy rhyming words, and why.

This science fair project teaches about mold. Students will test different foods to see which grow mold the fastest.

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

Stories change as you retell them. The objective of this science fair project is to demonstrate how information gets interpreted, distorted and changed.

In this science fair project, students discover how sedimentary layers form as sediments like mud, silt and sand settle over time.

Science fair project that determines whether lettuce that is harvested gradually yields more produce than lettuce that is harvested all at once.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

Do you think you can blow down a sand castle with a mighty wind? Find out which material stands up best to erosion in this erosion experiment.

This science experiment tests whether warm or cold water works best in making cut flowers last longer.

This experiment challenges students to forecast the weather based on the surrounding areas' weather.

The goal of this evaporation experiment is to learn about how different external conditions affect drying time.

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

Start your toy engines -- this is going to be a fast and friction-filled race!

This science project teaches young students about germs, bacteria, and the importance of washing their hands. Students will test what is the best way to wash.

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

Do earthworms like moisture or darkness? Find out as we explore the relationship between earthworms and light.

Children have a naturally inquisitive mind. Foster their curiosity with a walk through an autumn field or park to answer age-old “why” questions. As you walk with your child, you can encourage them to ask questions.

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

The objective of this science fair project is to examine the effects of temperature on salt and water solutions, as they form crystals over time.