World water distribution
97.4% sea water
World Fresh water distribution
22% ground water
1% lakes, rivers, biosphere
the top of the groundwater zone
unerground caverns and porus layers of sand, gravel or bedrock through which ground water flows
fresh water from precipitation and snow melt that flows across the earths surface.
precipitation that does not infiltrate the ground or return to the atmosphere by evaporation
the geographical area draining into a river or reservoir
reliable surface runoff
the amount of surface runoff that we can generally count on as a source of freshwater from year to year.
Factors causing water scarcity
... Factors causing water scarcity
is any chemical, biological, or physical change in water quality that harms living organisms or makes water unsuitable for desired uses
discharge pollutants at specific locations.
broad and diffuse areas from which pollutants enter bodies of surface water or air.
Sources of water pollution
Agricultural activities, industrial facilities, mining, increase in population and resource use.
effects of water pollution
illness and death in humans and other species, disrupts ecosystems
changes that occur after a body of water receives inputs of plant nutrients from erosion and run off
lake that is low in nutrients and very clear.