Covers the three main types of rocks, different weathering processes, erosion, and the rock cycle.

Learn about the different stages of the Earth's water cycle, and about processes involving water, including runoff, infiltration, and the differences between hard and soft water.

Discusses food, why we need it, and the types of nutrients that food for humans must have.

Looks at the two categories of natural resources, what they are used for, their distribution around the world, threats to natural resources, recycling and composting, and conservation.

Explains what a wildfire is, what causes them, how they behave, their impact, how to fight them, and how to prevent them.

Learn about milk and adult teeth, the types of teeth we have and their functions, the anatomy of a tooth, dental decay and tooth plaque, how to take care of your teeth, what dental braces do, what causes bad breath or halitosis, and why...

This site has a colorful display of information about Missouri. It contains a map, pictures, a list of state symbols, and links to related information.

This site has a colorful display of information about Nebraska. It contains a map, pictures, a list of state symbols, and links to related information.

A colorful display of information about Wyoming. Contains a map, pictures, a state symbols list, and links to related information.

Many of the objects you can see in the night sky are stars, large objects in space that produce light. Our galaxy, the Milky Way, contains more than 100 billion stars. Stars are so far away that their light does not reach us for years....

There are more than five hundred different species of skates and rays in our oceans. Scientists say that these fish are closely related to sharks, sharing a common ancestor from around 400 million years ago. This article provides an...

Chocolate begins as a seed of the tropical cacao tree. It has been a prized taste sensation for more than 2,500 years. One reason chocolate is so nice to eat is that it melts just below body temperature. So it really does melt in your...

In this interactive lesson supporting literacy skills, students watch video dramatizations that tell the story of the Spanish explorers who arrived in the Americas with Columbus and introduced European, African, and Asian plants and...

What colors do you see in a bubble? Why do you see colors in a bubble? Use this site to find out the answer to these questions with this easy experiment.

Students can make ooze and learn about different qualifications of matter. An easy procedure is provided to make gooey ooze that you can play with when you are done.

By making oil float on water--with the help of other ingredients--students can create a lava-lite effect.

Students create their own airplane using straws and other materials and learn the principles of aerodynamics.

Students can experiment with a home-made helicopter that lets them change the blades to see how real aerodynamics work.

Ever wonder why bats live in caves? Or why bats don't fly into objects at night? This article describe why bats thrive in the protected shelter a cave provides. It also explains how bats use echolocation to locate food and avoid obstacles.

Learn about the five things that all living things need to survive and why they are critical for both plants and animals.

Discusses the five characteristics that living things have and nonliving things do not.

Guess the letters in the words to save the colonist from the pillory. This play on hangman reviews historical vocabulary.

Students in Mexico answer questions about their lives, comparing their experiences to those of American children. They talk about popular names, celebrations, food, geography, social and environmental issues, the economy, history,...

A scanned copy of the 1852 publication of Abridged History of the United States by Emma Willard, a nonfiction book for children.