What cause the phases of the moon? Make a model to see how the positions of the Sun, Moon, and Earth cause the crescent, gibbous, quarter, full, and new moon.

Use dirt and different colors of craft sand to make unique layers in a clear plastic cup to represent the layers of the Earth.

We all know that the Moon has different phases, but it can be hard to figure out why. Try this activity to see how the Moon's phases really work.

Help your second grader observe the phases of the moon, and then let the fun loose: he'll get to chart his observations with marshmallows!

Test your skills as a weather forecaster, and learn some science terms on the way!

This interdisciplinary card game will have your third grader working on math facts as he travels through the solar system!

Your child helps the environment while saving your family money in this fun and rewarding "Gas Guzzlers" competition.

In this cool project, create a lighted, scale model of the different layers of the Sun, including the core, radiation and convection zones, and photosphere.

Turn an abstract lesson into a practical craft with the fun and colorful creation of dough earth layers!

Can you think of a way of cleaning dirty water using the sun? In this activity, you will be making a "solar still" that is able to do just that!

Learn about the microclimate of your backyard by tracking rainfall, temperature, and observed weather with hand drawn charts and graphs.

This simple experiment serves as an introduction to the greenhouse effect.

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.

Using plants and other items from the outdoors and clothing they already own, your kids can dress up as any one of the four seasons or simply as a Garden.

Get your child outside to observe the clouds, and get a fun exercise in science, writing, and arts and crafts! Here's how.

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

It's a rare kid who doesn't like a sandbox. Next time you're out digging, build in some earth science, too.

Help your young scientist celebrate the wonders of the night sky in the comfort of your own home.

Encourage your kindergartener to investigate and chronicle the weather she observes during the coldest months of the year.

The garden is the perfect place to practice math and science with preschoolers. Get digging (and counting, sorting, observing at the same time!)

Does your child always demand to know why the sky is blue, how the sun moves across the sky, or where wind comes from?

Help your child celebrate the summer and the sun by making a sandy seascape.

Make "fossils" with your child to hide in the sandbox or at the park or the beach, to help your child explore his archaeological side.

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

Help your child create a garden journal sketchbook as she observes and records the natural world through the changing seasons.

Help your second grade scientist explore the timely topic of wind speed using a version of the classic Beaufort Scale.

The rock cycle will come alive for your child when he uses broken crayons to create the three basic rock types.

Have your child make a special mobile inspired by the weather outside. Learn about seasons, the environment, and art in 3D.

Is our water polluted? Help your young scientist understand the importance of taking care of the environment with this simple experiment.

Kids are sure to be entranced by the magic of the ocean when they create their very own ocean in a bottle.