Gives definition of catalysis, an explanation of how it works, different kinds of catalysis and examples, substances that impact on the catalytic process, the many applications of catalysis, and a history of catalyst technology.

A description of the chemical and physical properties of carbon monoxide, its toxic effect on humans, sources of this gas, and beneficial uses. Includes a list of safety resource websites.

Article discusses the impact of air pollution on human health, and surrounding environments, in large urban areas around the world. Compares the levels of smog in the cities of Los Angeles and London, discusses air monitoring programs,...

A collection of articles and video dealing with the Gulf of Mexico.

Biography of Louis Agassiz, a natural historian and a contemporary of Charles Darwin. He was most famous for developing his theory of an Ice Age. Agassiz argued vehemently against the theory of evolution, based on his interpretations of...

Article cites factors affecting temperature change of Earth's water and explains thermal pollution's impact on our planet's ecology.

Article explaining what limestone is, how it is formed, where it occurs, the different types, and how it has been used throughout history. (Published: August 8, 2010)

An extensive research report on climate change in the Arctic and the impact this is having on the environment, flora and fauna, and indigenous peoples. (Updated: December 20, 2010)

Information about yellow fever, a disease transmitted by mosquitoes in tropical areas. The article discusses how to prevent yellow fever, and how the disease affects a person. (Published: February 28, 2008)

Discusses wind energy, how it is created, its history, benefits, negative effects, and what the future holds for this alternative energy source.

Article on white fir tree. Covers ways it is used by humans, distribution, physical features, habitat, and forest management. (Published: October 6, 2009)

Article explaining what viruses are, their evolution, taxonomy, morphology, and replication. Also covers mechanisms by which viruses cause disease, how they can impact on plants, and the potential and real benefits we get from...

Information on insect repellents and how to use them safely. Includes links to additional resources. (Published: July 18, 2012)

Defines the term predation, describes the types, and explains the roles predation plays in population management, in species diversity, and in natural selection. (Published: December 28, 2009)

Article describing the Pleistocene Epoch, which lasted from 1.8 million to about 10,000 years ago. It discusses species that lived then (e.g., the mammoth), and the climate changes that took place at that time. (Published: May 8, 2010)

Article on pine tree. Covers classification, physical features, ecology, and ways pine is used by humans. (Published: May 31, 2012)

Information about the element, Phosphorus, atomic number 15. Covers physical and atomic properties, the phosphorus cycle, phosphorus chemistry, and how exposure to white phosphorus affects human health.

Article explaining what organisms are, their cellular foundation, and how they get their energy and nutrition. (Published: May 26, 2010)

Information about the orangutan: its scientific classification, physical features, reproduction, behavior, diet, habitat, threats to its survival, and efforts being taken to protect it. (Published: August 7, 2010)

Article explaining what the nitrogen cycle is, and its role in an ecosystem. (Published: June 28, 2010)

Explains what natural gas is, how it is formed, its composition, measurement terminology, how companies locate and extract it, processing, how it is transported and stored, uses, and safety considerations. (Published: September 20, 2011)

Information about the Mojave Desert: ways it differs from other deserts, its conservation status, and efforts to protect it. (Published: April 30, 2010)

Information about the synthetic, radioactive element, Mendelevium, atomic number 101. Covers its discovery, physical and atomic properties, and details about permissible exposure.

Extensive article on mangroves. Covers classification, physical characteristics, life cycle, habitat, economic value, and natural and human threats to their survival.