Here's an introduction to different types of rocks.

Encourage your little environmentalist to learn about composting! Children will boost their reading skills as they learn what compost is and how it helps the environment.

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.

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

Space enthusiasts will love learning about Freedom 7, the first manned American space mission.

Here's a great worksheet for teaching your kids all about the planet Mercury. Did you know that it's the smallest planet in our solar system?

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

Do you know why Mars is called the Red Planet? Find out that and more on this planet printable.

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

What is the Earth? Here is a reading passage and a word search to help your kid get acquainted with Earth science.

Milky Way: candy bar or galaxy of 100 to 400 billion stars?

Discover some fun facts about the sun — and bring it to life with color — with this astronomy worksheet!

Have you ever looked into the night sky and wondered where all those millions and million of stars come from? Find out here with a mini astronomy lesson!

Does your little gardener know about compost? Test their knowledge of this sensationally smelly earth science process!

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.

From glaciers to mountains to wetlands, our planet has lots of different landforms. Help your child learn all about them with this fun earth science crossword.

Did you know that Uranus can get as cold as -144° Fahrenheit? Learn more about the third largest planet in our solar system on this planet printable.

Cave formations come in all kinds of shapes and sizes; get the scoop on common cave formations with this two page printout with a maze and vocabulary.

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

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?

This reading comprehension worksheet focuses on Brazil's incredible natural resources, targeting both Earth science and language arts.

How much do you know about our solar system's planets? Kids learn facts about Neptune in an out-of-this-world worksheet.

This worksheet features a scientific explanation and awesome photos of solar eclipses, which are extremely rare scientific phenomena.

How far away is the Red Planet from the sun? Find out with this great Solar System printable.