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

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

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.

Discover the difference between comets and asteroids in this stellar earth and space science worksheet!

Shake up your science studies with this worksheet about earthquakes.

Water covers 70% of Earth’s surface—but where exactly is it? Find out in this fifth-grade worksheet!

This earth sciences worksheet offers a simple and informative overview to a fascinating geological phenomenon.

Discover Earth’s different spheres with this fourth- and fifth-grade earth science activity!