Saturday, July 24, 2010
OZONE Hole [29-2]
A second permanent ozone hole was detected in the area of the North Pole in 1990, producing radical meteorological changes in parts of the Northern Hemisphere. In 1996, the World Meteorological Organization (UNO) measured the Southern Ozone Hole to be the size of the US and Canada combined. They are expected to increase in size until 2020.
Saturday, July 17, 2010
UN Peacekeeping Missions [65]
Saturday, July 10, 2010
Sunday, July 4, 2010
Ocean Upwellings [79]
Areas where colder, nutrient-rich, and biologically productive subsurface waters are brought to the surface. Phytoplankton thrives in these conditions and are at the base of the oceanic food chain. Therefore these are the biologically most productive areas. A combination of winds, currents, the Earth's rotation, shorelines and shallow bottoms induces upward and downward water movements. There are coastal upwellings as well as equatorial upwellings.
Subscribe to:
Posts (Atom)