Without light sources, we wouldn't have any light. Can you imagine a world without any light sources?

Introduce children to the food supply chain with this matching activity.

Children get to know animals of South America in this nature-themed worksheet.

Little biologists will use this respiratory system diagram to identify the most important parts of the human respiratory system and their functions.

This thoughtfully labeled periodic table includes information about the properties of all 103 elements.

Children get an introduction to plate tectonics in this geology worksheet.

This Awesome Anatomy coloring page is all about the human eye, and makes a handy study tool as well!

Pull the lever on learning! Get to know one of the six simple machines with this worksheet about the lever.

Studying human anatomy? Here is a great sheet that shows a diagram of all the muscle system. Your child will learn the scientific terms of the major muscles.

Next time you head outside for a hike or a camping trip, bring along this checklist of animal tracks!

In this worksheet, children practice identifying animals of North America by their tracks.

Does your second grader love farm animals? This easy writing exercise will help your child be more observant about tracks left by some familiar animals.

Kids learn important plant and animal cell vocabulary as they plug the words into their correct spots and complete the puzzle.

Here are listed a handful of natural resources, for kids to classify as renewable resources and nonrenewable resources.

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

Take a look into the layers of the earth with this soil science sheet! Your little digger can learn about the different soil layers and what lives in each one.

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.

Learn all about your body's most important muscle: your heart! This simple diagram is a great way to introduce your little biologist to his heart.

This cute worksheet asks your first grader to write down each part of the human body--encouraging research on life science and boosting his spelling ability!

Is your child baffled by the scientific method? Dr. McSquare is here to help! Learn the steps by helping the doctor organize his lab reports.

Learn to differentiate between physical and chemical changes in this science worksheet!

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

Don't let school year learning slip away this summer: use this chemistry worksheet to practice identifying elements.

Children copy the tracks of a frog, coyote, wild turkey, black bear, raccoon, and white-tailed deer in this nature-themed worksheet.

Dig your hands into some earth science with this soil sheet! Your little scientist can hone his reading skills as he learns what soil is and how it is formed.

Who knew that the machines of the world are all made of just 6 simple machines working together? Introduce your child to simple machines with this worksheet.

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

There's no better way to get your child thinking about the weather than by having them write about it. Kids write a sentence about the weather in each picture.

Dip your toes into a marsh habitat in this second- and third-grade worksheet!

Be a glow-getter with this energy transfer worksheet!