Dreams can be delightful or downright terrifying. Discover the science behind dreams and try to figure out what your dreams say about you.

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.

Get in tune with nature, and read a bit about an endangered species of animal, the Black-footed Ferret. Your child can color an illustration as he reads.

Look up into the night sky, and you may see three prominent stars side by side. This is Orion's belt, one of the most well known constellations!

Learn about the California tiger salamander, which uses its toxic, bad smell as a defense.

If you're fascinated by bugs, check out this coloring page featuring the insect order Odonata, which consists of damselfies and dragonflies.

What happens to water as it travels through mushy, smushy wetlands and swamps? Find out all about the water cycle and fill in scientific terms in the swamp.

Here's a quick overview of drought and flooding to spark thoughts or conversation with your kids about water.

These clever birds harden and disguise themselves as tree branches when threatened. Learn more and do some coloring with this worksheet.

Read about a little-talked-about bird that inhabits the wetlands of Yellowstone National Park, the sandhill crane.

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!

Increase your child's vocabulary and knowledge of the scientific world around him with a single sheet!

Does your little gardener know about compost? Test their knowledge of this sensationally smelly earth science process!

Did you know there are tiny owls? Learn all about the Elf Owl with this fun page, including a word scramble with words from the fun facts box.

Learn about Yellowstone National Park's peregrine falcons, which survived heavy pesticide use in the 1960s.

Read about one of Yellowstone National Park's coolest animals, the big horn sheep.

This word search introduces your child to important rocks and minerals vocabulary, as it strengthens his attention to detail.

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.

Grandma and grandpa didn't always have gray hair. Find out about what gives our hair color and what makes our hair lose that color as we get older.

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

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 cheetahs are the fastest land mammal? This fun worksheet is jam-packed with fun facts all about the cheetah.

Let your kid's knowledge of leaf vocabulary climb as high as a tall, tall tree with this fun word search.

Kids can explore ideas of storytelling and science as they fill in this comparison grid with their opinions. Start a conversation of ideas with this worksheet!

Test your third grader's biology knowledge with this worksheet, which challenges him to separate invertebrates from animals with a backbone.

This helpful worksheet lays out all the qualifications for planethood. A great way to start studying outer space science!

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

Meet Michael Faraday, the inventor of the first electric motor. Without Faraday, who knows if we would even have working cars, airplanes or even clocks!

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