Use your knowledge of sea creatures to fill out this crossword puzzle.

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

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

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