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Groundwater Contamination Videos Exercise
Watch videos and respond. Background: Modern civilizations have a profound impact on groundwater quality. From industrialization and urbanization associated with 21st-century `mega cities' and population increase, to intensive farming and deforesting, there is a significant use of resources and generation of waste that make groundwater unsuitable for use. Examples of groundwater contaminants include dissolved inorganic substances (e.g., chloride, sulfate, etc.) or organic liquids, dissolved organic/inorganic constituents, or pathogens from anthropogenic sources.
(Global Water Issues- 9)
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Groundwater Contamination - Introduction
Virtually any activity whereby chemicals or wastes may be released to the environment, either intentionally or accidentally, has the potential to pollute ground water. When ground water becomes contaminated, it is difficult and expensive to clean up. What the related video and answer the short questions that follow.
(Global Water Issues- 9)
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Groundwater Contamination - Variability & Natural Sources
Given its importance as a supply of freshwater needed to support society, the quality of groundwater is of paramount importance. Groundwater may not be suitable for use because it contains dissolved inorganic substances coming from natural sources (e.g., chloride, sulfate, etc.) or organic liquids, dissolved organic/inorganic constituents, or pathogens from anthropogenic sources. The purpose of this exercise is to explore variabilities in groundwater contamination that make management a challenge.
(Global Water Issues- 9)
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Groundwater Contamination - Agricultural & Nitrate
Nitrate has emerged as one of the most alarming and widespread contaminant of groundwater and surface water resources reported around the globe. Nitrate formation is an integral part of nitrogen cycle and is added either by the natural processes (atmospheric fixation, lightning storms) or through anthropogenic activities (fertilizer applications, septic tanks). Nitrate enters the hydrosphere easily, and its ingestion causes various health risks such as methemoglobinemia, cancer, diabetes, etc. on humans and to some extent on livestock populations as well. Agricultural practices and subsequent fertilizer application along with other anthropogenic activities are assumed to be the primary reason behind elevated levels of nitrate in groundwater.
(Global Water Issues- 9)
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Groundwater Contamination - Emerging Contaminants & PFAS
PFAS, also known as highly fluorinated chemicals, are a group of man-made substances used in products ranging from firefighting foam to microwavable popcorn packaging. When released into the environment, PFAS can travel far from their source, which heightens the chance of human exposure through drinking water or food. An analysis by the Environmental Working Group has shown that nearly 100 million Americans may have PFAS in their water.
(Global Water Issues- 9)
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Land Subsidence and Sinking Cities
Subsidence is a global problem and, in the United States, more than 17,000 square miles in 45 States, an area roughly the size of New Hampshire and Vermont combined, have been directly affected by subsidence. Land subsidence is most often caused by human activities, mainly from the removal of subsurface water. Other things that can cause land subsidence: aquifer-system compaction, drainage of organic soils, underground mining, hydrocompaction, natural compaction, sinkholes, and thawing permafrost.
(Global Water Issues- 9)
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Groundwater Depletion
In the drier areas of the world where surface water is scarce, groundwater is abstracted in large volumes in order to irrigate crops, and to a lesser extent for drinking water supply and industry. If groundwater abstraction exceeds groundwater recharge for extensive areas and long time, overexploitation or persistent groundwater depletion can occur. The resulting lowering of groundwater levels can have devastating effects on natural streamflow, groundwater fed wetlands and related ecosystems.
(Global Water Issues- 9)
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