Information about the man-made element, Einsteinium, atomic number 99. Covers physical and atomic properties, how it was discovered, its history, how it is produced, uses, and a list of its isotopes.

Describes the geography of the Chiangjiang Plain in China, its ecology, its conservation status, and threats to its biodiversity. (Published: August 3, 2007)

Detailed information about the physical characteristics, behavior, life cycle, distribution, habitat, etc. of the beluga whale.

Information about amphibians, animals that can survive in a wide variety of habitats and cli-ates. The article discusses their behavior, diet, predators, conservation status, and evolution. (Published: August 29, 2008)

Explains what an abiotic factor is, and discusses each of six types and their roles in ecosystems and habitats. (Published: July 31, 2010)

Provides information about benefits of having trees in one's yard or on a farm, how to choose one, where to put it, how to plant it properly and safely, and how to care for it. (Published: October 9, 2009)

A description of the element, Tantalum, atomic number 73. Covers the origin of its name, sources, uses for it in industry, and possible substitutes.

Article describing the Pliocene Epoch, which lasted from 5.3 million to 1.8 million years ago, and was part of the Cenozoic Era. It covers subdivisions of the Pliocene, geology, and climate. (Published: January 20, 2010)

Discusses what phosphates are, their role in the phosphorous cycle, where they occur in the natural world, their chemistry, and the impact of the use of phosphate fertilizers in agriculture.

Explains what pH is and its use in defining what acids and bases are. Also talks about the importance of pH for regulating metabolism in life forms. Includes a chart showing the pH values of common liquids. (Published: July 30, 2010)

A collection of articles on the Deepwater Horizon oil spill that happened on April 20, 2010. It was caused by an offshore explosion on an oil platform fifty miles southeast of the Mississippi River delta.

Discusses the chemistry of nitrate, the negative agricultural effects of too much nitrate in soil and in water sources, its toxicity to plants and livestock, and the impact on human health.

Explains the composition of natural gas and what is required to make it market-ready, types of reservoirs, and what happens in a natural gas processing plant. Includes a diagram showing the whole process. (Published: September 12, 2011)

Article on the types and function of larvae in the animal life cycle.

Describes the geography of the Great Victoria Desert in Australia, its biodiversity, conservation status, and the types of threats to its biodiversity that it faces.

A collection of articles on energy-related topics, including fossil fuels, conservation, alternative energy, and environmental issues.

Describes the structure and coding of DNA, how it replicates, and the role it plays at the cellular level. Looks at past and current research on DNA, and applications of this research. (Published: September 25, 2010)

A collection of articles, video, and some teaching guides on issues related to coastal ecosystems. Includes environmental issues, e.g., oil spills, and different types of ecosystems, e.g., mangroves and coastal grasslands.

A biography of Charles Darwin.

Gives definition of a carcinogen, examples, and the two categories of carcinogens - those known to cause cancer in humans, and those 'anticipated' to cause it.

Describes the geography of the Borneo montane rainforests, their biodiversity, conservation status, and the types of threats they face. (Published: December 8, 2006)

A large collection of articles covering many topics and specialized fields in the discipline of biology.

A large collection of articles, news items, photos, slideshows, animations, and scientific reports, all related to biodiversity. Many articles on different ecosystems, e.g., deserts, grasslands, forests, etc. An excellent resource for...

Lengthy illustrated article about the Arctic Ocean discusses all the many features and characteristics of this vast northern ocean--sea ice, icebergs, ice shelves, ice islands, the Arctic Ocean floor, continental shelf--as well as the...