If you push your little brother, does he push back? Well, according to Newton's third law of motion, he does!

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

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!

Studying human anatomy? Here is a great sheet that shows a diagram of all the muscle system. Your child will learn the scientific terms of the major muscles.

Introduce students to the third step of the engineering design process with this helpful template!

Learn more about the skin (and the science behind pimples -- ew!) in this printable life science diagram.

Use your knowledge of sea creatures to fill out this crossword puzzle.

There are some parts of our brains that are still too complicated for scientists to understand! Find out the basics of the brain's functions with this fun page.

How cool are chromosomes? Read what Steve the savvy scientist has to say about chromosomes and genes before testing your knowledge with some fill-in-the-blanks.

Test your knowledge of prehistoric animals with this life sciences crossword puzzle!

Learn the ins and outs of one of the body's most important organs: the heart!

Learn about the many different biomes the Earth is home to in this life science worksheet, which holds the answers to some simple life science questions.

Play a fun game that combines the periodic table with a classic concentration game.

Students learn all about fossil fuels with this research-based environmental science worksheet!

Can middle-grade chemists recover the missing information about these elements from the periodic table?

Get to know your genes with Steve the savvy scientist! Genes help determine everything from your hair color to your height.

Color in this Awesome Anatomy page on the respiratory system and learn about how we breathe!

This multi-page worksheet provides an opportunity for kids to practice both their understanding of food webs and their reading comprension skills.

Explore how waves interact with materials in this engaging physical science worksheet for middle grades!

In this engaging chemistry worksheet for middle grades, students learn about how concrete is made and how it is used in our society.

Children will learn important facts about food chains in these worksheets.

Studying the human body? Get to know your body inside and out with this muscle diagram.

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

Did you know that sound is actually caused by movement? Vibrations of particles create the sound that we hear.

Cranium, noodle, melon, noggin...the human skull has been called a lot of things over the years. Here are the proper names for each part.

This Awesome Anatomy coloring page is all about the human eye, and makes a handy study tool as well!

Learn more about what lives--and what thrives--in marshes with this fill-in-the-blank worksheet on marsh ecosystems.

Explore the difference between asexual and sexual reproduction in organisms with this middle school science worksheet!

Learn more about the swirling, whirling science behind tornadoes with this wild worksheet.

Explore the impact invasive species have on the environment with this research-based graphic organizer!