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Have you ever wondered why giraffes have long necks or why lions have sharp teeth? Find the answers in this third- and fourth-grade worksheet about adaptations!

Have you ever felt the sting of rug burn or rope burn? That's friction at work! Learn a bit about this important physical force with a comprehensive worksheet.

Learn all about your body's most important muscle: your heart! This simple diagram is a great way to introduce your little biologist to his heart.

Got a kid who's crazy for crosswords and the planet? Check out our Earth Day crossword puzzle, full of fun facts about the Earth and its many inhabitants.

We all know the famous equation E = MC^2. But what does it mean? Learn a bit more about Einstein's famous energy equation with this physical science worksheet.

Did you know that air has substance too? Learn about air resistance, also known as drag. Air resistance affects the movement of all the things on our planet!

Learn a bit about meteors, asteroids and comets as they travel across the night sky. Can your child round out the page by adding color to these orbiting rocks?

You can find rocks almost anywhere, but there's a lot more to rocks than meets the eye. Check out this science worksheet to learn all about rock formations.

Do you know how tornadoes form?This science worksheet diagrams what is known about what causes tornadoes to form.

Learn about pearls, which seem like normal jewelry from a factory but are actually made from the mucus of mollusks!

Did you know you're 1,000 times more likely to drown than you are to be bitten by a shark? This fun worksheet is jam-packed with fun facts about the shark!