How did salt ever get into the ocean? Find out how, and then try conducting your own salt water experiment.

Did you know that ocean water is salty, but river water is not? Find out how fresh and salt water mix together in this water cycle worksheet.

Unearth fossils in this explorative third-grade worksheet!

Analyze fossils with this engaging third-grade science worksheet!

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

Dig into the past with this third-grade worksheet all about fossils!

Uncover secrets of the past with this third-grade worksheet about fossils!

Discover the phases of the moon with this third- and fourth-grade space science worksheet!

Looking for a fourth grade worksheet to help your kid with science? This printable will test his knowledge of the water cycle.

Never heard of the planet Pirjute? That's because it's Jupiter, with mixed-up letters! Kids unscramble planet names on this third grade science worksheet.

Right now the Earth is spinning, whether we can feel it or not. Do you know why? Uncover the science behind our spinning planet with this informative worksheet.

Study the night sky with this hands-on science worksheet for third and fourth graders!

Discover the animals and plants of the past in this fossil-focused worksheet!

Search for natural resources with this fun worksheet for second and third graders!

Search for natural resources at the beach in this engaging worksheet for second and third graders!

Try to find natural resources in this camping-themed worksheet for second and third graders!

Look for natural resources around a farm in this engaging worksheet for second and third graders!

Help third and fourth graders become rock stars with this informative geology worksheet!

Third grader today, astrophysicist tomorrow! Let your child research their planet of choice, and discover everything from the number of moons to temperature.

Our ecosystems need a protector; is your third grader up to the challenge? Identify harmful pollutants in a science worksheet that doubles as a coloring page.

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

Did you know the surface of the Earth is always changing? Learn about the events that change Earth's surface with this crossword puzzle for second and third graders!

Without rain, we wouldn't have any puddles to splash and stomp in. Does your third grader know why and how rain falls from the clouds?

Get to know each of the Seven Summits, then organize their heights into a graph.

What is the Earth made of? Find out everything that goes on just below the surface in this science reading worksheet.

Learn about how the Earth was formed in this science worksheet that covers the early years of the Earth.

What does the Earth look like? Find out all about the nooks and crannies that cover the planet with this landforms worksheet.

How do the Sun and the Moon interact with the Earth, and how do all three depend on one another? Find out in this science worksheet.

This helpful worksheet lays out all the qualifications for planethood. A great way to start studying outer space science!

Life on Earth is vast and varied, from high in the sky to the bottom of the sea. Learn more about what lives on Earth with this reading and quiz worksheet.