Browse Reference Articles
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Mount Etna
Mount Etna is an active volcano on the east coast of Sicily, close to Messina and Catania. It is the largest active volcano in Europe, currently standing about 3,350 m (10,991 ft) high, though it ... > more -
Hurricane Hazel
Hurricane Hazel was the worst hurricane of the 1954 Atlantic hurricane season and one of the worst hurricanes of the 20th century. Hazel killed as many as 1,000 people in Haiti before striking the ... > more -
Tunguska event
The Tunguska event was an explosion that occurred at 60 degrees 55'N 101degrees 57'E, near the Podkamennaya (Under Rock) Tunguska River, in what is now Evenk Autonomous Okrug, at 7:17 AM on June 30, ... > more -
Temperature
Temperature is the physical property of a system which underlies the common notions of "hot" and "cold"; the material with the higher temperature is said to be hotter. Physically, temperature is a ... > more -
Nitrogen oxide
NOx is a generic term for the various nitrogen oxides produced during combustion. They are believed to aggravate asthmatic conditions, react with the oxygen in the air to produce ozone, which is also ... > more -
Lead poisoning
Lead poisoning is a condition, also known as plumbism or painter's colic, caused by increased blood serum lead levels. The symptoms of lead poisoning include neurological problems, such as reduced ... > more
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