Blue whale facts include that calves weigh up to three tons at birth and adults can be as heavy as 200 tons. Get other cool blue whale facts on this worksheet.

Did you know that the screw is actually one of the six simple machines? This handy machine helps to make work easier!

Little space explorers, meet Mercury, the closest planet to the sun! This planetary coloring page comes with some fun facts about Mercury.

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

Understand nature's visual cues for the shifting of the seasons with this tree seasons match-up activity!

Hug a tree! It can be a home to many different animals. Can you identify the different shelters used by animals in this picture?

Just like all plants and animals, you go through different stages in life too! Help your child to see how he will change and grow throughout his life.

Little scientists can learn about a fundamental concept of physical science with this worksheet all about density!

Kids follow corn as it grows from seed to vegetable on this simple cut-and-paste growth chart.

Plants may not have feet, but they do move! Help your child learn different ways seeds travel.

A coloring sheet of a Mars rover searching for life on other planets.

Discover the inner workings of basic earth science in this worksheet on temperature.

Microscopes bring biology to life, allowing us to explore the world's tiniest living things. Have your child create his own organism in the sample slide.

The rainforest is a vibrant, lush place teaming with life! Your little nature explorer can take an expedition to find the many hidden animals in this scene.

Here are four examples of mineral resources for kids to think about, plus a short explanation of what a mineral resource is.

Learn some new words and facts about precious minerals with this word-scramble and matching worksheet.

Fact: This worksheet is about unusual animals from all over the world. Opinion: This is the best fact and opinion worksheet ever!

Did you know that trees have more parts than just the trunk, branches and leaves? Take a look on the inside of a tree with this fill-in-the-blank diagram!

This worksheet tests kids' understanding of basic heredity by asking them to match parent turtles with their offspring based on similar traits.

Lots of people like turtles, but how much do you really know about them? Get to know one of many types of turtles with this informational worksheet.

Learn about the animal practice of hibernation in this quick science worksheet.

This tree anatomy worksheet will give your little naturalist a better understanding of the parts that make up a tree.

Our silkworm facts help your little one understand more about these special invertebrates. He'll read about their life stages and answer some questions.

Did you know that an elevator is actually one of the six simple machines? Help your child understand how the pulley works.

Can you tell which types of weathering caused each of these changes in the earth? This activity is a great way to review the 3 main types of weathering.

Learn about the California tiger salamander, which uses its toxic, bad smell as a defense.

How do you make recycled paper? Learn all about the recycling paper process on this informative worksheet.

Young inventors will have a blast with this worksheet on compound machines! Use three of the six machines together to make work easier.

This page is all about building your kid's natural resources vocabulary words, along with research skills.

This spikey Stegosaurus looks fierce, but don't worry -- he's a vegetarian! Learn all about this massive dinosaur with a fun fact sheet.