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In this science fair project, students make their own rain gauge to measure rainfall.

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

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

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.

This classic children's game demonstrates how sound travels through air vs. through a solid.

Construct and experiment with a periscope using reflected light rays to gather an image.

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.

Experiment with buoyancy to learn how a submarine rises and sinks in this classic science experiment.

Have your kid determine if a goldfish can be conditioned to expect food the same way Pavlov's dogs did with this fascinating science fair project.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

Science fair project which measures whether tsunamis are more destructive when they are caused by an earthquake or by a meteor.

Why does honey crystallize? This science fair project project answers this question and identifies the variable that makes this sweet solute crystallize faster.

In this fun experiment, we'll find out how color affects heat absorption!

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.

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

4th graders construct an ocean food web to learn about consumers and trophic levels, food webs, and food chains in this cool ecology science fair project.

What does a raindrop look like when it splashes on the ground? Is each raindrop unique like snowflakes? Find out how raindrop size varies in this experiment.

In this experiment you will replicate the mummification process by making a hot dog mummy.

This science fair project idea researches the different layers of the atmosphere and creates a visual representation of the atmospheric layers.

In this science project, learn about water transport in plants and make a beautiful dyed floral arrangement with cohesion, adhesion, and xylem tubes!

How does a flashlight work? Kids will make a complete circuit and explore how voltage contributes to brightness with this science fair project idea.

How does water pressure change with depth? Kids learn how pressure works underwater with this cool and easy demo.

Science fair project which simulates the global conveyor belts on a small scale, and observes the effects of wind, density and temperature on water movement.

How does a compass work? What's a magnetic field? Kids will build their own compass at home to find the answers in this great science fair project idea.

In this cool experiment, learn how to find specific gravity of minerals using liquids of different densities to see which substances and items sink and float.

Science fair project about work and energy which uses a simple mathematical formula to predict how far a jar will roll down an incline.

Climates with more snowfall have more coniferous forests and fewer deciduous ? Learn about how pine trees in a coniferous forest adapted to withstand snow.

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.

Kids build a desert food chain, desert food web, and desert food pyramid in this cool science fair project to learn about trophic levels and consumers.