GSC1620 Chapter 11. Resources Overview and Water as a Resource. Resources (Background). Earth resource – any valuable or useful commodity extracted from the Earth
Resources Overview and Water as a Resource
Hydrologic cycle – powered by solar energy, the continual circulation of Earth’s water
through the atmospheric, surface, and subsurface reservoirs.
Groundwaters constitute circulation of Earth’s water
about 95% of Earth’s
liquid freshwater resources!
About half of the US population relies
on groundwater for drinking water!
Oakland Press circulation of Earth’s water
June 12, 2005
Brochure distributed in 2005 by the Brandon Township circulation of Earth’s water
Phase II Stormwater Management Education Group
Oakland circulation of Earth’s water
fractures circulation of Earth’s water
Acidic soil water circulation of Earth’s water
Limestone or similarly soluble
Caverns exposed when water table
Cavern deposits of precipitated rock (usually limestone) circulation of Earth’s water
Approximately 25% of the world’s population lives atop karst topography!
Effect of land subsidence karst topography!
Geotimes, July 2008 karst topography!
Shaded sections karst topography!
represent sections of the U.S.
where groundwater extraction
rates significantly exceed
Groundwater Depletion West of karst topography!
Along marine coastlines or on oceanic islands, excessive withdrawal of groundwaters can facilitate a form of groundwater pollution called “saltwater intrusion” (see figure)
Numbers represent karst topography!
billions of gallons
Egypt pushes Ethiopia to scrap Nile dam karst topography!
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 karst topography!
Examples of? karst topography!
Desalination – conversion of saline to fresh water via filtration or distillation (see figure)
Source: National Geographic, April 2010