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History
Overexploitation
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Overexploitation, also called overharvesting, refers to harvesting a renewable resource to the point of diminishing returns. Continued overexploitation can lead to the destruction of the resource, as it will be unable to replenish. The term applies to natural resources such as water aquifers, grazing pastures and forests, wild medicinal plants, fish stocks and other wildlife.
Atlantic cod stocks were severely overexploited in the 1970s and 1980s, leading to their abrupt collapse in 1992.
Atlantic cod stocks were severely overexploited in the 1970s and 1980s, leading to their abrupt collapse in 1992.
When the giant flightless birds called moa were overexploited to the point of extinction, the giant Haast's eagle that preyed on them also became exti
When the giant flightless birds called moa were overexploited to the point of extinction, the giant Haast's eagle that preyed on them also became extinct.
Cows on Selsley Common. The tragedy of the commons is a useful parable for understanding how overexploitation can occur.
Cows on Selsley Common. The tragedy of the commons is a useful parable for understanding how overexploitation can occur.
The Atlantic bluefin tuna is currently overexploited. Scientists say 7,500 tons annually is the sustainable limit, yet the fishing industry continue t
The Atlantic bluefin tuna is currently overexploited. Scientists say 7,500 tons annually is the sustainable limit, yet the fishing industry continue to harvest 60,000 tons.
Aquifer
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An aquifer is an underground layer of water-bearing material, consisting of permeable or fractured rock, or of unconsolidated materials. Aquifers vary greatly in their characteristics. The study of water flow in aquifers and the characterization of aquifers is called hydrogeology. Related terms include aquitard, which is a bed of low permeability along an aquifer, and aquiclude, which is a solid, impermeable area underlying or overlying an aquifer, the pressure of which could lead to the formation of a confined aquifer. The classification of aquifers is as follows: Saturated versus unsaturated; aquifers versus aquitards; confined versus unconfined; isotropic versus anisotropic; porous, karst, or fractured; transboundary aquifer.
Water in porous aquifers slowly seeps through pore spaces between sand grains
Water in porous aquifers slowly seeps through pore spaces between sand grains
Water in karst aquifers can form subterranean rivers.
Water in karst aquifers can form subterranean rivers.
Texas blind salamander found in Edwards Aquifer
Texas blind salamander found in Edwards Aquifer