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This science fair project idea highlights decomposition rates by comparing how long it takes an item to decompose in a compost pile vs. a landfill.

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

In this experiment, students find out what happens when a less-dense fluid interacts with a denser one, replicating the effect of cooler solid rock on magma.

The purpose of this science fair project is to determine which conditions and materials quicken the composting process to make the best compost.

This is a fantastic and easy science experiment where kids will learn about elasticity by testing how high bouncy balls of different materials can bounce.

The objective of this science fair project is to examine the basic principles of air pressure using simple materials like a balloon, straw and string.

Science fair project that examines how to grow bacteria in a controlled setting, using simple materials from around the home.

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.

The goal of this science fair project is to discover the science behind carbonated soft drinks and apply this knowledge to create a new one.

Find out whether a longer airplane will fly farther or a wider paper airplane.

Science fair project which tests various sedimentary, igneous and metamorphic rocks to find out whether one rock family is stronger than the others.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

Watch pre-packaged seeds and seeds taken from inside fruits and vegetables grow. Which ones will grow faster? Read more in this science fair project idea.

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

Check out this fun science fair project to make a vinegar and baking soda balloon and demonstrate how gas is created as a result of the chemical reaction.

This science project teaches students the relationship between compost and plant growth. Students conduct an experiment with different types of compost.

The objective of this science fair project is to analyze the effects of salinity and temperature on water.

The objective of this science fair project is to observe the differences in heat absorption for darker colors vs. lighter colors.

This science fair project idea explores substances that cause a bubble to last longer.

This project investigates the affect of storage temperature on microwave popcorn.

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

This science fair project idea develops an understanding through experimentation of which shapes are the most structurally strong.

Is cleaning with lemon effective? Get ready to give this science project some elbow grease and find out if acidic lemons can be used as a cleaning agent.

The purpose of this science fair project is to study the properties of sugar and examine individual preferences for sugar and other sweeteners.

This science fair project idea investigates emulsifiers that allow oil and vinegar to mix.

Could there be toxic chemicals lurking in the cupboards and closets of your home?

This science fair project idea determines what household items are good conductors of electricity.

In this experiment we will be determining whether birds prefer certain colors of seed.

Learn whether Mylar Balloons last longer than Latex Balloons or vice versa.

This science project lets students explore the number of spots on a ladybird and how to treat ladybugs with respect.