Have you considered why elephants have trunks, or why polar bears have thick fur? Reflect on animal adaptations with this fourth-grade worksheet!

See just how connected the ears, nose and throat are with this anatomy worksheet!

Your child will write about his or her favorite animal. Kids will research their favorite animals online or at the library, then write down three facts.

Learn about the integumentary system, which is really just a fancy phrase for "skin", in this worksheet.

Bird-watchers will love this worksheet, featuring just a sample of the many song birds flying around Yellowstone National Park.

Help your 2nd grader write out fractions in this underwater adventure.

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

Learn more about the bones in your body and just how important they are with this reading sheet and diagram, all in one.

Constellations are not just named after animals, some of them are named after people! Learn about the constellation Sagittarius with this fun worksheet.

This skeletal system worksheet, featuring a funny diagram of a human skeleton, is just the thing kids need to master their skeletal system vocabulary.

This mole has a pouch for its young, just like kangaroos. Get your child into life science learning with this fun coloring page.

Did you know people can live with just one kidney? Get a head start on human anatomy with this info sheet on kidneys.

Introduce your child to a fascinating new animal, the Baird's tapir. This is just one of many endangered species around the world.

Do you need a job? Well, this elephant is looking for a new symbiotic partner, and you could be just the candidate he's looking for!

Just like the rest of our body, our eyes are a complicated system! Learn about how the human eye works with this anatomy sheet.

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

Just like people, animals have babies that grow up into adults. On this worksheet, Kids draw a line to match each baby with its adult version.

Where'd that shadow come from? Next time a scary shadow crosses your path, you'll know just what to look for.

Atoms are some of the tiniest particles that make up our world. Give kids some perspective with this worksheet that shows kids just how small atoms are.

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

Did you know that trees have more parts than just the trunk, branches and leaves? Take a look on the inside of a tree with this fill-in-the-blank diagram!

With this fun sheet, your child will get to learn a few fun facts about the raven, and then complete a crossword based on what she's just learned.

Just like all plants and animals, you go through different stages in life too! Help your child to see how he will change and grow throughout his life.

Who knew that the machines of the world are all made of just 6 simple machines working together? Introduce your child to simple machines with this worksheet.

Explore the science of the sun with this make-your-own sundial activity! Just do a little bit of cutting and coloring, and let the sun do the rest of the work.

Ocean resources are an incredible part of how we live our lives; read and write about them with this worksheet.

Read the definitions given for soil, sand and dirt then write down where each element can be found below the pictures.

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.

Read the definitions of soil, sand and dirt then write where you can find each type below the pictures. Nurture your budding geologist!

What's your favorite animal? Kids love answering that question, and with this animal research graphic organizer, they can write all about it.