Do plants get crowded? Have your curious kid investigate how plants respond if they're forced to grow together in a confined space.

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

This recipe makes bubbles that not only blow up nice and big, but do tricks and experiments! How do you do it? It's not a secret, it's science!

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

When you cut a flower to put into a vase, it'll eventually wilt, even with water and sunshine. But is there another scientific secret to keeping flowers fresh?

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

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

This science fair project examines how seeds hitchhike on animals and clothing.

This science fair project idea investigates how magnetism can defy the force of gravity.

How do organic materials become soil? This science experiment measures what materials biodegrade.

Do different types of oil mix or stack? Find out in this science fair project idea!

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.

How can we describe the relationship of magnetic field strength vs. distance? Kids will find out with this free science fair project idea.

In this science fair experiment, children demonstrate the relationship between the amount of stuff and the amount of pressure in a closed system.

In this project combining nature, art, math, and science, children make rubbings of leaves then observe shapes and structures and sort the leaf images.

How does dishwashing liquid work? Kids discover the chemical mechanism behind cleansing power in this easy science fair project idea.

In this science fair project, we'll use a liquid crystal thermometer to find out whether exercising makes a difference in people's temperature.

This science experiment has students test whether a snail moves faster on concrete or dirt.

In this science fair project, students use the streak test to tell minerals apart from each other.

This science fair project idea's objective is to become familiar with items your family regularly throws in the trash.

This science fair project teaches students the differences between fruits and vegetables.

In this science fair project, kids observe the expansion of liquids when frozen and determine if some liquids expand more than others in the freezing process.

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

This science fair project enhances the understanding and awareness of energy use and explores the concept of energy efficient.

This science fair project idea investigates whether air has mass and weight.

This science fair project idea demonstrates that plants give off water.

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

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.

Find the North Star, and measure your latitude! The purpose of this science fair project is to find latitude and learn about geographic locations.

This science fair project idea teaches to understand and explore the concepts of crystal formation and dissolving substances.