Help your first grader explore the world of scientific measurement by "weighing" fruit with a "water scale"!

This science fair project idea demonstrates that plants give off water.

Water, along with soil and light, is a necessary component for plant growth. So what's better for promoting plant growth: tap water, or rain water?

Do this experiment to help your first grader understand how salt can be removed from salt water. All it takes are a few household materials.

Help your kindergarten scientist explore an important part of earth science: how soil retains water.

This project is a vivid, concrete introduction to the basic but important idea that plants need sunlight and water to grow.

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

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

Blend science and math to explore a very important first grade social studies question: does our planet contain more land or more water?

Introduce your child to the wonders of colorful chemistry with this simple food coloring project.

Help your kindergarten scientist understand the concept of surface tension with this simple science experiment.

This science fair project idea explores how length affects the weight a bridge can hold.

What is surface tension? Kids will discover how water-skating insects use surface tension to keep from sinking by making a model water walker.

In this science fair project, you'll make a "ghost" appear in a test tube, and learn about what happens when hot water and cold water interact.

Can you dig it? This science experiment isn't for kids who like to keep their hands clean.

Help your kindergarten science maven explore the water cycle without getting everything wet.

Teach your child about using pumps to move water in this simple and educational preschool science activity!

This science fair project idea investigates which objects float and sink in honey, water, and oil.

In this science fair project, young children discover what happens when two fluids that have different densities get together.

Here's a classic celery science experiment that uses celery and food coloring to demonstrate how plants absorb water.

How much water comes out of snow? Explore this timely question with your kindergarten scientist with this easy winter experiment.

Kids will learn how to clean fish tank the natural way. Add catfish to the tank and see if your water gets cleaner.

The objective of this science fair project is to examine the effects of temperature on salt and water solutions, as they form crystals over time.

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

Water can go from solid to liquid to gas...but how does popcorn go from kernel to snack? Invite your first grade scientist to find out.

Help your kids fall in love with nature by making a simple clay bird bath. Set it up in your yard and watch the animals venture in for a sip of water.

You don't need to head to the Arctic to experiment with life in an igloo. Learners can build their own ice igloo at home from water and empty milk containers.

This project explores whether plants can live and grow when "watered" with juice, soda, or milk.

Here's a science activity that lets a first grader use an empty dish detergent bottle to create his own fountain as he explores air pressure.

Put a twist on traditional oil painting with this fun science activity that you and your first grader can do together.