This science fair experiment idea's objective is to understand the general concept of an acid and a base.

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

Explore how sound waves are reflected and absorbed by producing echoes. Analyze which locations produce echoes.

This science fair project idea explores whether a plastic slinky works as well as a metal slinky when walking it down the stairs.

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

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.

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

Introduce your fourth grader to the concepts of solstices by observing the length of her shadow on the shortest day of the year, compared to other solstices.

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

What are buttress roots? In this fun science project, make a model of a rainforest tree and learn how they help trees survive in the tropical rainforest!

Get your hands on a concoction that breaks the rules about what's a solid and what's a liquid.

Children combine an acid and an alkaline substance to simulate a volcano eruption in this fun experiment.

Create a soda bottle garden that defies gravity! This hanging terrarium is housed in a soda bottle and perfect for crafty kids with a growing green thumb.

This kinesthetic learning activity will help your fourth grader get a firm grasp on the immensity of the solar system.

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

Have your child build a model of a coral polyp, one of the tiny animals that composes a coral reef.

This science fair project idea investigates how optical distances change the apparent size of an object as seen through a magnifying lens.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

This science fair project idea examines whether boys and girls differ in reflexes.

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.

What combination of cloth and stain will be the easiest for removing stains? Test and experiment!

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

This science project idea examines the effect of microwaving on various objects.

What are the effects of fertilizer on plant growth? What's the best fertilizer type (solid, liquid or powder)? Kids find out in this science fair project idea.

In this design challenge, your child will create a parachute for a small toy using typical household items.

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

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

This science fair project idea determines if crystals will absorb food dye and if colors will mix by the process of diffusion.