Help your child understand the importance of preserving the environment, with this info-sheet about an endangered species: the Iranian jerboa.

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

Learn all about the science of the movies and the basic concepts behind how they work.

Use the clues in this crossword puzzle to fill in the blanks with different types of snake names. Learn interesting facts about snakes as you go!

Get in tune with nature, and read a bit about an endangered species of animal, the Black-footed Ferret. Your child can color an illustration as he reads.

Help your child understand why it's so important to take care of the environment with this info-sheet about an endangered species: the spectacled bear.

Looking for a worksheet to help your kid with science? This printable will help him with his knowledge of geology.

Find out more about what REALLY dwells in swamp ecosystems with this worksheet all about swamps.

Introduce your flashlight to mirrors. Mirrors are cool surfaces that reflect light just as well as they reflect your face.

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

Practice geology vocabulary with this challenging crossword puzzle.

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

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

Do you know the functions of the primary organs in the human body? Put your knowledge to the test with this fourth- and fifth-grade crossword!

Earth has many different land and water features—can you recognize them? Test your knowledge with this crossword puzzle for third and fourth graders!

Discover examples of weathering, erosion, and deposition with this fourth-grade worksheet!

Can you identify the difference between inherited and acquired traits?

Did you know that each tree tells a story? In this worksheet, children peer inside a tree to learn about the layers in its trunk.

Study the night sky with this hands-on science worksheet for third and fourth graders!

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

Let your kid's knowledge of leaf vocabulary climb as high as a tall, tall tree with this fun word search.

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

Flex your engineering design muscles with this engaging STEM worksheet for upper elementary students!

Test your knowledge of electrical energy with this third- and fourth-grade worksheet!

Study ecosystem changes with this drought-focused worksheet for fourth and fifth graders!

Think creatively about classroom objects with this STEM-focused scavenger hunt!

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

Apply concepts of energy and motion to marbles in this fourth-grade worksheet!

Unscramble key vocabulary words about energy and collisions with this engaging science worksheet!

Determine which magnets have the strongest force in this third- and fourth-grade worksheet!