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!

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.

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.

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.

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.

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.

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.

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.

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.

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

Let your child put her thinking cap on and take a moment to write about the influence people might have had on the formation of landforms.

Encourage your child to take a nature walk, using the prompts on this worksheet to write and draw their observations of plants, animals, sounds, and more.

Meet the beetle! Filling out this simple worksheet can help your 5th grader learn the anatomy of a beetle.

Kids love squids! This simple squid diagram will help your 5th grader memorize the squid anatomy.

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

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.

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

Learn more about the swirling, whirling science behind tornadoes with this wild worksheet.

Celebrate the fall season with this nature sketchbook, perfect for any lover of the outdoors!

Learn all about Alexander Fleming, the man who invented penicillin and the happy accident that brought him to it.

This Earth Day quiz family and friends with this true or false questionnaire. It's all in good, informative, fun!