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

Which comes first, genus or phylum? To complete this life science crossword, kids need to put the 9 levels of biological classification in the correct order.

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

Review the different body parts with a fun crossword! This is a great way for your little doctor-in-training to review the basic organs and their functions.

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

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

Use the clues in this crossword puzzle to fill in the blanks with different types of snake names. Learn interesting facts about snakes as you go!

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

Do you know which animal has two humps? Your child will use clues to determine what animal name fits in the crossword puzzle with this worksheet.

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

Practice geology vocabulary with this challenging crossword puzzle.

Earth has many different land and water features—can you recognize them? Test your knowledge with this crossword puzzle for third and fourth graders!

Review energy terminology with this fun fourth-grade crossword puzzle!

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!

Review the rock cycle with this second-, third-, and fourth-grade crossword puzzle!

Review the terminology of collisions with this engaging crossword puzzle for fourth graders!