Do you know the functions of the primary organs in the human body? Put your knowledge to the test with this fourth- and fifth-grade crossword!

Break down a word to create new ones with this fun worksheet for second through fifth graders!

Test your knowledge of prehistoric animals with this life sciences crossword puzzle!

Kids learn important plant and animal cell vocabulary as they plug the words into their correct spots and complete the puzzle.

There are a lot of structures that make up a new plant, called a seedling. Your child will learn what they're called with this life science word search.

For all you mad scientists, here is a helpful lab safety 101! You'll get to read a few basic rules, and then complete a word search.

Dinosaurs and other creatures don't exist anymore! Learn the names of some extinct animals, and look for them in this fun wordsearch puzzle.

You have over 600 muscles in your body! Kids can try this muscle anatomy word search featuring 14 important muscles.

Children learn the fascinating physics behind lightning, along with a few fun facts, in this physical science worksheet.

Did you know that invertebrates don't have backbones? Find out some different types of invertebrates with the clues in this crossword puzzle.

Use clues to fill in the boxes in this crossword puzzle, and learn more about freshwater fish along the way.

What's the animal that swims upstream? Help your child figure this out with this cold-blooded animal crossword puzzle worksheet.