Here's a thorough, easy-to-understand breakdown of the color wheel that includes primary, secondary and tertiary colors.

Grab your trusty flashlight and get ready for a scientific treasure hunt!

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.

Even colors have best friends. In the world of color, these best friend pairings are called complimentary colors.

Light travels so quickly that sometimes we can forget it even travels at all. Learn all about the direction light travels and perform your own experiment!

Need a colorful way to impress your friends and family? This worksheet has got you covered!

Right now the Earth is spinning, whether we can feel it or not. Do you know why? Uncover the science behind our spinning planet with this informative worksheet.

Brush up on some physics vocabulary with this energy word search!

Budding scientists will learn about the density of salt water and perform an experiment with food coloring, salt water, and fresh water.

What is the water cycle? We're glad you asked! Learn about this amazing natural system that's been working for billions of years.

Introduce children to physicist Albert Einstein — and a bit of theoretical physics — with this mini biography.

A handy worksheet that breaks down the properties of metal. A good physical science review sheet to keep around for reference.

Does your little scientist know the different types of energy? Explore energy with this helpful info sheet!

Get to know the Apollo 11 space mission in this science and history worksheet!

Students flex their physical science knowledge by classifying items as solids or liquids in this fourth grade states of matter worksheet.

Who knew that the machines of the world are all made of just 6 simple machines working together? Introduce your child to simple machines with this worksheet.

Looking for a quick reference about gravity and a definition for kids? This two page worksheet and activity has you covered!

Every four years something funny happens with our calendars -- we add a day! Why do we do this? Discover the science behind leap year.

Teach your child the difference between potential and kinetic energy with this introductory worksheet.

Science can be a bit of a bore to some students, but with this quick worksheet on chemical and physical reactions, it can at least be a breeze.

Never heard of the planet Pirjute? That's because it's Jupiter, with mixed-up letters! Kids unscramble planet names on this third grade science worksheet.

This worksheet teaches your student about physical change vs chemical change, matter, mass, and property. An exciting experiment reinforces the concepts.

Is your fourth grader learning about electricity? This worksheet is all about circuits, tests her skills and reinforces the concept of how a circuit works!

What is solar energy? Discover how we use the power of the sun, and complete this worksheet about an important renewable energy source.

Together, water and photosynthesis are the source of all life on Earth! Little curious minds will enjoy discovering the ins and outs of photosynthesis.

This worksheet teaches your child about physical properties of water, specific heat, kinetic energy and more.

Give your budding chemist the facts and practice she needs for measuring with graduated cylinders.

Children learn the fascinating physics behind lightning, along with a few fun facts, in this physical science worksheet.

Have you ever wondered what keeps the moon in orbit? Newton's first law gets a quick introduction, too, in this worksheet for kids. Check it out!

Students practice classifying items as liquids or solids for a lesson on the states of matter in this fourth grade physical science worksheet.