Every four years something funny happens with our calendars -- we add a day! Why do we do this? Discover the science behind leap year.

Looking for a quick reference about gravity and a definition for kids? This two page worksheet and activity has you covered!

Learners will discover what heat waves are, and how they are connected to global warming, in this two-page earth sciences worksheet.

Let your kid's knowledge of leaf vocabulary climb as high as a tall, tall tree with this fun word search.

Learn a bit about meteors, asteroids and comets as they travel across the night sky. Can your child round out the page by adding color to these orbiting rocks?

Learn about some of the major U.S. watersheds in this fascinating science and geography worksheet!

Discover how cover crops enrich soil and support healthy crop growth with this research-based worksheet for fourth and fifth graders!

Discover Earth’s four major systems, or spheres, in this engaging fifth-grade worksheet!

Learn what distinguishes a meteoroid, meteor and meteorite with this outer space science sheet!

What is Pluto? According to scientists... no, not quite. Find out more behind the answer to that age-old question.

How was our solar system created? Read a bit about one of the most well-known theories in this worksheet about the Big Bang.

Our solar system has hundreds of moons! Read a bit about how a moon is formed with this lunar lesson.

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.