Diamonds, rubies, sapphires, pearls, and opals are among the most precious stones found under the earth. Whether ornamenting royal scepters or equipping modern medical technology, this new… More →

Chalk and amber are two forms of fossils that provide us with clues as to how life has evolved, both in the oceans and on land. Fossils takes a fascinating look at how and where fossils… More →

Unlike other metals, such as copper or lead, gold is prized for its beauty and scarcity rather than its usefulness. As a metal, it is too soft to use for tools or weapons, and is used mainly… More →

This valuable resource provides teachers with useful suggestions on how to teach the subjects covered in the Rocks, Minerals, and Resources series. More →

Minerals are non-living natural materials and are the most common substances on Earth. Rocks are composed of combinations of minerals. Some minerals are easy to find such as silver, quartz,… More →

The Babylonians and Sumerians were using thick, gooey oil as early as 5000 BC as pitch to caulk their boats and hold their building bricks in place. Oil is actually a fuel, like coal, but its More →

To most people, the primary purpose of salt appears simply to be to make food taste better. Yet salt is so important that it has been used as money and has supported the economy of many… More →

Sand and soil are both formed from rock. Types of soil form depending on the climate in different parts of the world. The relationship between humans and animals and the soil is a delicate… More →