This science fair project idea demonstrates sonar mapping of the ocean floor.

Do this experiment to help your first grader understand how salt can be removed from salt water. All it takes are a few household materials.

This science fair project examines how tsunamis travel by simulating a tsunami moving around an island. You will generate a pretend tsunami in a swimming pool.

This balloon-powered car project is a great way for your kid to learn about energy and how it can be used efficiently.

Every time a sound is produced it emits a sound wave. This experiment demonstrates how sound travels, using nothing more than a spoon and a string!

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.

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

This science project examines the history of earthquakes and what we can do to prevent future disasters.

This science fair project demonstrates the principles of reflection through simple experiments involving mirrors and light.

Explore the scientific concept of capacity by seeing how many pennies you boat can hold before it sinks!

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

The purpose of this science fair project is to build a basic radio.

Help your second grade scientist explore the timely topic of wind speed using a version of the classic Beaufort Scale.

The goal of this science fair project is to assess the acidity levels of common food and household products using pH test strips.

What is the Doppler Effect, or the Doppler Shift? The purpose of this science fair project is to determine how distance impacts the Doppler Effect.

The objective of this experiment is to identify common materials that absorb sound waves with the greatest efficiency.

The goal of this science fair project is to evaluate the effect of heat on sound wave frequency.