GSC1620 Chapter 11. Resources Overview and Water as a Resource. Resources (Background). Earth resource – any valuable or useful commodity extracted from the Earth
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GSC1620 Chapter 11
Resources Overview and Water as a Resource
Water as a Resource
Hydrologic cycle – powered by solar energy, the continual circulation of Earth’s water
through the atmospheric, surface, and subsurface reservoirs.
about 95% of Earth’s
liquid freshwater resources!
About half of the US population relies
on groundwater for drinking water!
June 12, 2005
Brochure distributed in 2005 by the Brandon Township
Phase II Stormwater Management Education Group
Acidic soil water
Limestone or similarly soluble
Caverns exposed when water table
Cavern deposits of precipitated rock (usually limestone)
Approximately 25% of the world’s population lives atop karst topography!
Effect of land subsidence
Geotimes, July 2008
represent sections of the U.S.
where groundwater extraction
rates significantly exceed
Groundwater Depletion West of
Along marine coastlines or on oceanic islands, excessive withdrawal of groundwaters can facilitate a form of groundwater pollution called “saltwater intrusion” (see figure)
Water Supply and Use Topics
billions of gallons
Egypt pushes Ethiopia to scrap Nile dam
Published: Oct. 19, 2012 at 10:50 AM
CAIRO, Oct. 19 (UPI) -- Egypt increasingly views Ethiopia's plan to build a massive 6,000-megawatt hydroelectric dam on the Nile River as a threat to its national security because it will seriously cut the Arab state's water supplies.Egypt depends on the Nile for virtually all of its water and is mounting a major diplomatic and economic campaign to scupper the plan. "Even direct military action by Egypt cannot be ruled out," observed the U.S. global security consultancy Stratfor.Both countries have undergone major political upheavals recently, which have added to the tension in a long-running battle for control of the world's longest river which rises in the Ethiopian highlands. Egypt's Muslim Brotherhood now controls the presidency and Parliament following the February 2001 downfall of longtime dictator Hosni Mubarak and is locked in a struggle for supremacy with the military.Longtime Ethiopian ruler, Prime Minister Meles Zenawi, as harsh a dictator as Mubarak and whose ethnic Tigray group has long dominated the military, died Aug. 20, leaving a leadership vacuum and internal rivalries.
What’s the Great
Desalination – conversion of saline to fresh water via filtration or distillation (see figure)
Source: National Geographic, April 2010