This experiment requires only lemon juice, salt, sugar and grapefruit. Your budding scientist can get a great introduction to science by testing her own tongue!

Fossils can tell us about life on earth, but they can also teach kids the scientific method.

What is geothermal energy? Find out how we use parts of the Earth to provide us with renewable energy!

Learn more about molecules and how they comprise the air all around us in this intro-to-earth-science worksheet.

Plants need to breathe and eat food (energy) just like us! Help your budding naturalist to learn about photosynthesis.

Introduce your child to the inclined plane, one of the six simple machines that helps to make work easier for us!

Ever wonder why sounds change as they move away from us? Learn all about the Doppler effect with this physics worksheet.

Fossils have a lot to teach us about life on earth, but they can also be used to help teach kids the scientific method.

Use this simple graphic organizer to map out a new word and explore it in depth.

What does a plant need to grow? Just like us, plants need food, water and air! Help your child understand more about plant life.

Microscopes bring biology to life, allowing us to explore the world's tiniest living things. Have your child create his own organism in the sample slide.

Are cats trying to talk to us when they purr? Discover the meaning behind the purr in this worksheet that explores the three main types of cat purrs.

Read about Alexander Graham Bell, the man who made it possible for us to stay connected all day long, in this biography that comes with a science experiment.

Nature is all around us! But how much does your child know about our natural world? Test her knowledge with some nature fun-facts trivia.

Learn all about rivers--how they were formed, what they're made of, and what they do for us and the planet--in this reading and science worksheet.

Here's a stormy science adventure that will blow your socks off! Learn about tracking hurricanes with this map of coordinates.

Can you explain why your blue shirt is blue? This worksheet is full of facts about light and how it reacts with objects to give us the perception of color.

How does blood flow through the heart? This worksheet prompts kids to map how blood is pumped through this sophisticated organ.

Hiccups interrupt us when we're talking and sometimes even get in the way of eating! Find out why we hiccup and discover some unusual ways to get rid of them.

Not your typical crossword, this puzzle will have your child learning to recognize the shapes of the continents. Great for map skills and vocabulary!

Children learn why the light from the sun seems white to us, why we see objects in color, and why the sky is blue in this beautiful and fascinating worksheet.

Learn about some of the major U.S. watersheds in this fascinating science and geography worksheet!

Kids will learn about fossils in this worksheet. Help your child learn about the scientific method by getting him to examine a fossilized dinosaur skeleton.

When we get embarrassed or anxious, and all of a sudden our cheeks get red! Why does our body do this? Find out what scientists think blushing is all about.

Teach your little scientist the difference between physical and chemical changes, on a molecular level.

Both of these animals have big ears! Your child will look at the pictures of unusual animals in this worksheet and try to learn some new things about them.

Learn more about two kinds of aquatic biomesÃfreshwater and saltwater biomesÃand how you can tell them apart.

Take a science-filled trip to an amusement park in this third- and fourth-grade worksheet!

This science worksheet tells all about James Watt, the man that powered the Industrial Revolution.