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

Budding inventors can get a fun review of the simple machines with this word search.

I spy with my little eye... six simple machines! Here's a fun way to help your child review the simple machines.

Renewable energy is extremely important for the Earth's future! Test your child's knowledge of renewable resources with this review sheet.

Is a feather liquid, soft, spotted, or heavy? Practice describing everyday objects, or matter, with this second-grade science worksheet!

Analyze everyday objects and identify states of matter with this second- and third-grade science worksheet!

Learn about the texture and hardness of different objects in this second-grade worksheet!

How many machines can you find around the house? You may find them where you least expect it!

What is geothermal energy? Find out how we use parts of the Earth to provide us with renewable energy!

What do a key, a goldfish, and a tortoise shell have in common? Find out with this second-grade science worksheet!

Practice describing different objects and substances in this colorful worksheet!

This science vocabulary activity is packed with basic science vocabulary words to help the youngest kids warm up to scientific concepts.

Children put their science vocabulary to the test with this engaging crossword puzzle!

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.

Explore magnetism with this colorful science worksheet for third and fourth graders!

What do juice, water, and tea have in common? Compare and contrast matter in this engaging second-grade worksheet!

Can melted wax turn back into solid wax? Can scrambled eggs turn back into raw eggs? Learn the answers to these questions and more with this second-grade worksheet about reversible and irreversible changes!

Put your prediction proficiency to the test in this third-grade physical science worksheet!

Get a lesson in sports and science with this engaging third- and fourth-grade worksheet!

Take a science-filled trip to an amusement park in this third- and fourth-grade worksheet!

Introduce your budding scientist to chemical reactions with this simple and fun science experiment!