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Learn all about rivers--how they were formed, what they're made of, and what they do for us and the planet--in this reading and science worksheet.

What happens to our food after we swallow it? Chomp on some body science with this diagram of the digestive system.

Flex your mind muscles with a body science worksheet! Your child will learn the fundamentals of what makes up our muscles.

How cool are chromosomes? Read what Steve the savvy scientist has to say about chromosomes and genes before testing your knowledge with some fill-in-the-blanks.

What is solar energy? Discover how we use the power of the sun, and complete this worksheet about an important renewable energy source.

What is the water cycle? We're glad you asked! Learn about this amazing natural system that's been working for billions of years.

What does the pancreas do? Kids will check out the diagram, read a paragraph, and put their reading comprehension skills to the test by filling in the blanks.

Have you ever wondered what keeps the moon in orbit? Newton's first law gets a quick introduction, too, in this worksheet for kids. Check it out!

Did you know that sound is actually caused by movement? Vibrations of particles create the sound that we hear.

Energy is a crucial part of physical science! All things on Earth have energy, whether it's potential or kinetic.

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

Have you ever felt the sting of rug burn or rope burn? That's friction at work! Learn a bit about this important physical force with a comprehensive worksheet.

Introduce children to photosynthesis with this fill-in-the-blanks life sciences worksheet!

Get to know your genes with Steve the savvy scientist! Genes help determine everything from your hair color to your height.

Learn about the many different biomes the Earth is home to in this life science worksheet, which holds the answers to some simple life science questions.

Discover how water flows in this informative environmental science worksheet!

Cells are the building blocks of all living things! Help your little scientist learn the basics of a cell with this fun activity.

Did you know there are clouds in space? They are very different than the ones on Earth! Read a bit about nebula in this space science worksheet.

Get a brief history of the atom with this introductory page for young physicists!