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

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

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

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.

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.

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!

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!

Life on Earth is vast and varied, from high in the sky to the bottom of the sea. Learn more about what lives on Earth with this reading and quiz worksheet.

Take a quick lesson in the otters that inhabit Yellowstone National Park and take an even quicker quiz.

Milky Way: candy bar or galaxy of 100 to 400 billion stars?

If your child loves animals, introduce her to a cool species of bird with this Northern Hawk Owl info sheet, complete with coloring and a crossword.

Can you guess how the Screech Owl got its name? Learn some fun facts about this species of owl with a fun info sheet!

Learn a new species of bird with a fun info sheet! Your child will get to read some fun facts about the Sharp Shinned Hawk, and complete a crossword.

Find out more about what REALLY dwells in swamp ecosystems with this worksheet all about swamps.

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

Back in ancient times, the stars were used as storytelling tools. People created characters and stories that they saw in the stars, like Leo the lion.

Where is the Earth in space? Check out this worksheet that describes where weÃand some of our neighborsÃare in our galaxy.