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

Discover the importance of butterflies in pollination with this informative worksheet!

Unearth fossils in this explorative third-grade worksheet!

Discover the animals and plants of the past in this fossil-focused worksheet!

Uncover secrets of the past with this third-grade worksheet about fossils!

Dig into the past with this third-grade worksheet all about fossils!

Did you know that one of the main ingredients of a perfect pearl is dust? Learn all about the bizarre process behind every pearl with this science worksheet.

Analyze fossils with this engaging third-grade science worksheet!

Do you ever see shapes in the stars at night? In ancient times, people named these shapes, and now we know them today as constellations!

Start from water cycle precipitation from clouds and match parts of the cycle to this clear colorful image of a simple water cycle, using the helpful paragraph.

Track the traits passed down from parent to offspring!

Experiment with renewable energy from the comfort of home by creating a pizza box solar oven!

Teach your kids all about the second planet from the Sun with this simple science sheet.

Not your typical crossword, this puzzle will have your child learning to recognize the shapes of the continents. Great for map skills and vocabulary!

Cave formations come in all kinds of shapes and sizes; get the scoop on common cave formations with this two page printout with a maze and vocabulary.

How far away is the Red Planet from the sun? Find out with this great Solar System printable.

Take a look and learn all about this beautiful and rare tiger from the islands of Sumatra in Indonesia.

Test your child's science savvy with this worksheet, which asks your child to identify what items are made from plants.

In this animal-based life science worksheet, students will learn that animals inherit certain traits from their parents.

What makes a reptile different from an amphibian?  Learn all about animal classifications in this worksheet for second and third graders!

Third grader today, astrophysicist tomorrow! Let your child research their planet of choice, and discover everything from the number of moons to temperature.

Butterflies and moths may have very different colors, but they are from the same insect order! Learn about lepidoptera with a fun coloring page.

Glass is everywhere, but have you ever wondered where it all came from? It doesn't grow anywhere -- we have to make it!

Coyotes' famous howl gave them the nickname "song dogs." This is just one of several coyote facts your child can learn from this worksheet.

Did you know cougars can leap 20 feet from a sitting position? This fun worksheet is jam-packed with fun facts about the cougar!

The California condor has been brought back from the brink of extinction. This worksheet will help your little bird lover learn all about the condor.

Without rain, we wouldn't have any puddles to splash and stomp in. Does your third grader know why and how rain falls from the clouds?

Looking for a way to teach your kids all about the planets? This worksheet is the way to go. It features Venus, the second planet from the sun.

Little gardeners, get to know your plants! See the cycle of a plant from its birth to adulthood, and read a bit about photosynthesis too.

From glaciers to mountains to wetlands, our planet has lots of different landforms. Help your child learn all about them with this fun earth science crossword.