What is biomass energy? Learn about an important form of renewable energy with this colorful worksheet.

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

Learn about the life cycle of a tomato plant in this worksheet for second and third graders!

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

Learn about Yellowstone National Park's peregrine falcons, which survived heavy pesticide use in the 1960s.

Learn about the second fastest land mammal in the Western Hemisphere, the pronghorn antelope.

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

Budding scientists can learn about an important physical science concept with this worksheet all about density!

Learn about bison, some of biggest creatures in Yellowstone National Park, or anywhere else for that matter.

Here's a beautiful science page to help your child learn the different types of clouds.

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

Learn all about the cumulonimbus cloud, more commonly known by a much more fearsome name: the thundercloud!

Learn about Red River Hogs in this series of animals facts sheets and coloring pages in one.

Learn the scientific names of this popular flower and its partner, the grasshopper, with this fun coloring sheet!

The best way for your young explorer to learn and understand how nature works is by going outside!

Stretch your backbones and learn about the creatures that have a spine and those you don't!

Your nature lover can learn the basics of drawing a tree with this simple step-by-step guide.

Learn about Yellowstone Park's lynx, the cats that put your average house cat to shame.

Learn about the life cycle of a wood frog in this second- and third-grade worksheet!

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

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

Through a simple matching activity, kids learn how their actions can have a direct effect on the environment.

The narwhal is one unusual animal! Your child will learn about this horned sea creature through text and pictures.

Learn the difference between behavioral and physical adaptations with this cut-and-paste worksheet for second and third graders!

Color in the gold and red colors of this common grasshopper species and learn about insect orders with your child!

Learn to identify and name the parts of a seed in this two-page science worksheet and quiz!

How does the butterfly become so beautiful? Learn about the four stages that it goes through in its life.

Wolves are an animal with a bit of rough past in Yellowstone National Park. Learn all about them!

Aspiring astronomers, here is a wonderful introduction to the constellations! Your child can learn about Aries the ram with this worksheet.

Learn more about what lives--and what thrives--in marshes with this fill-in-the-blank worksheet on marsh ecosystems.