Children will learn why and how to compost as they help with the process of filling their compost, turning it, and observing the changes that occur.

Here's a fun math and science activity: help your child explore four different kinds of measurement, using their hand and a few simple household tools.

What is topography? Kids find out by learning to make and read a topographic map in this awesome science fair project idea.

Your third grader will delight in learning about sound waves as he observes the different sounds created by tapping on glasses with varying amounts of water.

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

Learning about how plants grow is a building block in the early grades science curriculum. Put a fun twist on this life science concept with these cup monster friends!

Combine your child's natural curiosity with his developing classification and writing skills by helping him create a backyard field guide.

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

This clay "painting" activity encourages and supports creative development and critical thinking skills.

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

This experiment has students record rat behavior to learn about the benefits of rats and research rat myths throughout history.

Household items and a bit of imagination will create a CSI kit for your child to have investigative adventures with. Explore the world of forensic science!

Did you know a mouse eats almost fifty times as much as a cow? Find out how and test out the strange science with your friends!

In this activity, students will think about the form and function of household objects as they compare and contrast kitchen serving spoons of various sizes and designs.

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

In this activity, your child will be challenged to build a tall tower out of building bricks! The instructions include questions prompts to guide students through the design challenge.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

There are many benefits to bugs and insects. This science project shows how cockroaches, termites, and other critters benefit our planet.

Crayons aren't just good for creating colorful masterpieces -- they're also great for science!

Observe with your third grader what happens when food starts to decompose, and boost science skills simultaneously with this experiment!

Have you ever noticed the way a dropped stone makes a fun pattern in a pond or lake? What's the science behind these splashy occurrences?

Ever wondered how a plant drinks water? This science project will teach you how and help you create a beautiful floral display!

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!

Learn about this simple machine and make a pulley of your own to use for fun science trials.

Science fair project idea that examines different physical characteristics of a chosen animal. Make educated guesses about evolution based on animal's form.

The goal of this science fair experiment is to demonstrate the effects of air pressure on objects and analyze applications of air pressure principles.

What's a liquid? What's a solid? What better way to experiment than by turning a childhood favorite, ice cream, into a homemade science lesson!

Children will learn all about cause and effect as they experiment with potion-making in this Halloween themed activity.

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

Here is a hands-on activity to help third graders understand the four points of a compass...and how we use them to get around.