Did you know that the screw is actually one of the six simple machines? This handy machine helps to make work easier!

The infamous Halley's Comet only comes around once every 75 years or so! Read some interesting info on the world's most famous comet.

What is water energy? Also known as hydro power, water energy is one of our important renewable resources!

Don't let your kid bark up the wrong tree! Engage him in a word search filled with tree terms, boosting his attention to detail and problem solving skills.

It's easy being green when you have our Earth Day game for a guide. Just print out this Earth Day game and get ready to score one for the planet.

This Earth Day quiz family and friends with this true or false questionnaire. It's all in good, informative, fun!

Here's an introduction to different types of rocks.

Ever wonder what's inside a camel's hump? Your child will become familiar with animals that live in the desert with this fun activity sheet!

Got a gardening guru on your hands? Give them a fun challenge with this fill-in-the-blanks quiz about the parts of a seed!

Cut out and complete this trophic level pyramid template!

Learn more about the bones in your body and just how important they are with this reading sheet and diagram, all in one.

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.

This Awesome Anatomy sheet focuses on the brain, often considered the most vital of vital organs.

Looking for a fourth grade worksheet to help your kid with astronomy? This printable will help him learn the relative sizes of planets.

If your kid loves the ocean, he may enjoy learning tons of trivia about our fishy friends in the sea. Brush up on your fish facts with this fun page!

What is biomass energy? Learn about an important form of renewable energy with this colorful worksheet.

What is Pluto? According to scientists... no, not quite. Find out more behind the answer to that age-old question.

This printable features the planet closest to the sun. Learn Mercury facts and further your knowledge of outer space by discovering new things.

This worksheet features a scientific explanation and awesome photos of solar eclipses, which are extremely rare scientific phenomena.

Learn all about how to convert kilograms to pounds in this weight conversion worksheet.

Use this cool 2-page worksheet to make your own big dipper clock!

Meet Michael Faraday, the inventor of the first electric motor. Without Faraday, who knows if we would even have working cars, airplanes or even clocks!

If you're looking to color a chimpanzee, you won't find a coloring page better than this one. Learn some facts about these animals while you're at it.

Quiz your kid on the names of bones in his spine with this colorful worksheet.

This bright and colorful worksheet helps your child bring the technical terms of the bones in his legs down to size.

Does your child know his five senses? Give him an introduction to human anatomy with this sense of touch worksheet.

Does your child have a knack for astronomy? Teach him about the constellations with this great worksheet.