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

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.

Read about Yellowstone's red foxes, some of the most cunning and smart animals around.

The Earth is very much alive, even its rocks shift and change. Practice geology vocabulary with this challenging word search.

How much do you know about our home planet? Boost your Earth knowledge with this science printable.

In this worksheet, children will learn about the intricate "waggle dance" honeybees use to communicate to each other.

Wolves are an animal with a bit of rough past in Yellowstone National Park. Learn all about them!

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.

Do you know why Mars is called the Red Planet? Find out that and more on this planet printable.

Children match animals to their ecosystems in this life sciences worksheet.

Invite your child to dream big and design their very own planet. Encourage both creativity and scientific speculation with this fun worksheet.

What is energy? Energy is the ability to do work! Use this colorful worksheet to teach your little scientist the basics of energy.

Dive deep into your body's circulatory system with this worksheet on blood and what it's made of.

Give your kid help with his science skills with this worksheet, which practices natural disaster vocabulary.

All kids love animals, but how much does your child know about them? Kids will get to learn some animal vocabulary with this wild crossword puzzle.

Think toads and frogs are the same? Think again! Check out this breakdown of the differences between the two, complete with a quiz to check your new knowledge.

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

Children hone their powers of observation using this worksheet template.

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

Learn about the great horned owl of Yellowstone National Park, a bird so big and mean that it has the nickname, "tiger owl."

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

Did you know that there are forests in the temperate ocean ecosystem? Learn all about the temperate ocean with this fun ecosystems sheet!

Does your learner ever wonder what makes the Earth dark at night and bright during the day?

How much does your child know about the animal kingdom? Help her discover interesting facts with this animal crossword.

Discover some fun facts about the sun — and bring it to life with color — with this astronomy worksheet!

Learn all about light refraction by simply placing your pencil in a glass of water. Warning: your pencil may not be quiet the same afterward.

In which habitat could you find an arctic fox, a polar bear, and a snowy owl? Have your kid find tundra animals with this word search worksheet.

Does your budding biologist know his plant parts? Get a great review of some important plant vocabulary with this info page.

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?

Kids find grassland animals in this third grade science word search. Animal habitat worksheets help students learn about life forms in different environments.