Play with balance and simple engineering as you hurry to create a sturdy rock tower.

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

In this project, you'll build a model of the earth, complete with all seven continents and four major oceans.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

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

Here is a fun middle school science project on factors affecting solubility. Learn how dissolved solids can "crash out" to form crystals when conditions change.

This project leads to an understanding that a whole may be built of smaller parts that fit and work together and provides an introduction to basic tools.

In this experiment you explore how tectonic plates move to create land and expand bodies of water.

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

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?

The goal of this golf science fair science fair project is to determine whether the temperature of a golf ball affects its elasticity and its rebound.

Get down to the rubber with this science project that tests the effectiveness of different types of erasers.

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

Science fair project examining barometric pressure, and how it can be used to predict the weather. How does atmospheric pressures relate to weather conditions?

Collect meteorite dust with a magnet in your very own backyard! The objective of this science fair project is to gather meteorite dust to study outer space.

How does frost form? How fast does it form? Do this simple science project using a plastic glass, rock salt and some water to learn about deposition.

What is elasticity? Students will investigate how this concept applies to bouncing ball physics by testing the bounces of balls made out of different materials.

This science fair project idea explores how length affects the weight a bridge can hold.

Learn about sound physics and do a survey experiment to explore the difference between sound and noise in this science project.

Learn about the role of Earth's rotation on the Coriolis Effect and hurricanes in this science project. Model the Coriolis Effect on a hurricane's direction.

Do hand soaps and sanitizers prevent the growth of bread mold? If so, why? Kids will find out with this fun and informative science fair project idea.

Kids will build a turtle habitat in order to observe the climate preferences of this cold-blooded reptile.

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

Can you dig it? This science experiment isn't for kids who like to keep their hands clean.

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

This project compares the strength of one, two, and three-ply toilet paper.

How do animals keep warm? In this experiment, find out whether fat insulation resists cold temperatures and learn how this works in the animal kingdom.

This fun experiment provides a concrete and visually striking illustration of photosynthesis.

In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

Science fair project that examines the behavior of water and gravel in creek beds and the formation of sedimentary rocks.