Browse Reference Articles
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Global Positioning System
The Global Positioning System, usually called GPS, is the Earth's only fully-functional satellite navigation system. A constellation of more than two dozen GPS satellites broadcasts precise timing ... > more -
Chimpanzee
Chimpanzee, often shortened to chimp, is the common name for the two extant species in the genus Pan. The better known chimpanzee is Pan troglodytes, the Common Chimpanzee, living primarily in West, ... > more -
Hurricanes and Cyclones
Severe Weather
Natural Disasters
Tornadoes
Energy and the Environment
Renewable Energy
Hurricane preparedness
Hurricane preparedness includes actions taken before a tropical cyclone strikes to mitigate the damage and personal danger such storms can cause. ... > more -
Soil contamination
Soil contamination is the presence of man-made chemicals or other alteration to the natural soil environment. This type of contamination typically arises from rupture of underground storage tanks, ... > more -
List of disasters
This is a list of world disasters, both natural and man-made. A disaster is a natural or man-made event that negatively affects life, property, livelihood or industry, often resulting in permanent ... > more -
Winter storm
A winter storm is a type of precipitation in which the dominant varieties of precipitation are forms that only occur at cold temperatures, such as snow or sleet, or a rainstorm where ground ... > more
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