Investigate the mystery of why two tomato plants developed so differently!

What has two legs and carries its baby in a pouch? Fill in this crossword puzzle and learn some fun facts about two-legged creatures!

These are the largest tortoises in the world, yet they are only two inches long when they hatch! That's one of the facts you can learn from this worksheet.

Dive into the electrifying concept of electrical energy in this colorful worksheet!

Ever wonder what's inside a camel's hump? Find out with this fun worksheet! It's jam-packed with facts about camels.

Practice classifying different animals in this engaging life science worksheet, created for second and third graders!

Students practice classifying items as liquids or solids for a lesson on the states of matter in this fourth grade physical science worksheet.

Who will win the marble race in this two-page physical science worksheet?

Renewable energy is extremely important for the Earth's future! Test your child's knowledge of renewable resources with this review sheet.

Use this cool 2-page worksheet to make your own big dipper clock!

Learn to identify and name the parts of a seed in this two-page science worksheet and quiz!

Ever wonder what's inside a camel's hump? Your child will become familiar with animals that live in the desert with this fun activity sheet!

Match forms of energy to common examples in this third- and fourth-grade science worksheet!

Do you know what's the largest parrot in Africa? It's the African grey parrot! Learn about this blabbering bird and give the image some color.

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?

Looking for a fun way to supplement your child's science learning? Try out a life science crossword puzzle! This one's all about ecosystems.

Explore the strength of magnetic forces with this worksheet for third and fourth graders!

Fly high with The Wright Brothers, two siblings who soared to the forefront of history with their design for the first modern airplane.

In this worksheet, children practice identifying animals of North America by their tracks.

Crossword puzzles are a great way to make life science learning fun. This one's all about natural selection, and it's sure to give your child a fun challenge.

Uncover secrets of the past with this third-grade worksheet about fossils!

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

Cave formations come in all kinds of shapes and sizes; get the scoop on common cave formations with this two page printout with a maze and vocabulary.

Launch into learning with this worksheet on Gemini 4, one of the original missions in the early days of the U.S.'s space program.

Read about Yellowstone's red foxes, some of the most cunning and smart animals around.

This worksheet features Mercury, the smallest planet in our Solar System, and also the planet that's closest to the Sun.

Learn about Yellowstone Park's lynx, the cats that put your average house cat to shame.

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.

Guinea pigs are social animals that make great pets. Test your child's knowledge of these furry critters with this fun quiz.

Test your little nature-lover's knowledge about our feathery friends. Can she figure out which bird fits each description?