Learn the ins and outs of one of the body's most important organs: the heart!

The grizzly bear once roamed across most of North America; now its habitat has shrunk to the northwest. Discover more about the grizzly with this worksheet.

Peel back the layers of the earth in this earth science worksheet. Can you name all of them?

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.

Almost half of all known fish species call ponds, lakes, rivers, and other freshwater habitats home. Learn about freshwater fish in this worksheet.

Take a plunge under the surface of the earth! With this worksheet as your guide, you may explore the geological processes of our planet.

In this worksheet, kids learn about friction by answering questions about the amount of friction in different situations.

Give your kid help with his science skills with this worksheet, which practices natural disaster vocabulary.

In this North American animal tracks worksheet, students hone their observation skills by matching tracks to animals.

Launch into learning with this worksheet on Gemini 4, one of the original missions in the early days of the U.S.'s space program.

Learners will get to know the bald eagle, the national bird of the United States and an inhabitant of Yellowstone National Park.

Do you measure distance in inches or seconds? When do you use miles? Answer these and more with this third-grade worksheet about the customary system of measurement! 

What is the purpose of a hard shell or a long neck? Discover different adaptations with this matching worksheet for second and third graders!

Where is the Earth in space? Check out this worksheet that describes where weÃand some of our neighborsÃare in our galaxy.

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

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.

Children learn why the light from the sun seems white to us, why we see objects in color, and why the sky is blue in this beautiful and fascinating worksheet.

This worksheet teaches all about the planet Saturn and its placement in the Solar System.

Children label the eight planets of our Solar System in this simple astronomy worksheet.

Learn all about essential laboratory equipment with this hands-on worksheet for fourth and fifth graders!

Have you ever wondered why giraffes have long necks or why lions have sharp teeth? Find the answers in this third- and fourth-grade worksheet about adaptations!

Learn how seeds move with this second- and third-grade matching activity!

Confused about continents? Get better acquainted with all the continents on earth with this word scramble.

Get to know the Apollo 11 space mission in this science and history worksheet!

Discover the differences between gravity and magnetism in this forceful worksheet!

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

Break down a word to create new ones with this fun worksheet for second through fifth graders!

Not your typical crossword, this puzzle will have your child learning to recognize the shapes of the continents. Great for map skills and vocabulary!