Have you ever wondered why manhole covers are round? It's a good thing to know -- big companies sometimes ask that question in interviews.

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.

Learn about spider tortoises, one of the world's tiniest tortoise species, with this handy worksheet. Can't go to the zoo? We bring the zoo to you!

Can't go to the zoo? We bring the zoo to you! Check out the fulvous whistling duck, a bird with social skills and the willingness to share each other's nests.

What is the Earth made of? Find out everything that goes on just below the surface in this science reading worksheet.

It's easy being green when you have our Earth Day game for a guide. Just print out this Earth Day game and get ready to score one for the planet.

If you know what each planet looks like, you'll have no trouble with this intergalactic crossword puzzle.

A fun challenge for kids, this Earth Day crossword puzzle is a great way to review facts about the Earth and get a reminder on how to live green.

Budding scientists can learn about an important physical science concept with this worksheet all about density!

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

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

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

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

Peel back the layers of the earth in this earth science worksheet. Can you name all of them?

Did you know that Uranus can get as cold as -144° Fahrenheit? Learn more about the third largest planet in our solar system on this planet printable.

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

Blast off deep into space with this science worksheet featuring the dwarf planet, Pluto.

Here's a great worksheet for teaching your kids all about the planet Mercury. Did you know that it's the smallest planet in our solar system?

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

Put your kid's observational skills to the test with this word search that will help her learn some of the animals that inhabit a rainforest.

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.