Most DO in water comes from the atmosphere or plants. The oxygen comes from tumbling water on fast moving rivers that mix atmospheric oxygen with water. Photosynthesis is another way of oxygen entering water. DO levels are often highest in ...
http://www.switzerland.k12.in.us/watershed/do.html
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Dissolved oxygen (DO) is essential for the maintenance of healthy lakes and rivers. The presence of oxygen in water is a good sign. The lack of oxygen is a signal of severe pollution. Rivers range from high to very low levels of dissolved oxygen. ... Where Does the Oxygen Come From?
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www.indiana.edu/~bradwood/eagles/dot.htm
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Tips for the testing of Dissolved Oxygen: ... Oxygen is critical to the survival of aquatic plants and animals, and a shortage of dissolved oxygen is not only a sign of pollution, it is harmful to the fish. Some aquatic species are more sensitive to oxygen depletion than others, ... Where Does The Oxygen Come From?
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www.lamotte.com/pages/common/techtips/dotip.html
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Where does dissolved oxygen come from? ... So far we've seen that dissolved oxygen can come from the air or from photosynthesis, and that when water warms up, there is a net loss of dissolved oxygen. Besides warming, how else can dissolved oxygen become depleted?
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www.sciencebuddies.org/mentoring/project_ideas/EnvSci_p...
www.sciencebuddies.org/mentoring/project_ideas/EnvSci_p014.shtml
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How important is dissolved oxygen to the environment? What are communities or people in the area doing to increase dissolved oxygen or maintain proper level? In Nature, where does Dissolved Oxygen come from? What would happen if too much Dissolved oxygen was in the water?
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en.allexperts.com/q/Environmental-Science-1471/Dissolve...
en.allexperts.com/q/Environmental-Science-1471/Dissolved-Oxygen.htm
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Dissolved oxygen is probably the single most important water quality factor that pond managers need to understand. Oxygen dissolves in water at very low concentrations. Our atmosphere is ... Nutrients can wash into the pond from woods, pastures, fields, human activities in the watershed, or come from pond fertilization.
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aquaplant.tamu.edu/contents/dissolved_oxygen.htm
aquaplant.tamu.edu/contents/dissolved_oxygen.htm
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What is dissolved oxygen and why is it important? ... Oxygen is measured in its dissolved form as dissolved oxygen (DO). If more oxygen is consumed than is produced, dissolved oxygen levels decline and some sensitive animals may move away, weaken, or die.
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www.epa.gov/volunteer/stream/vms52.html
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Water Quality Monitoring: Dissolved Oxygen ... Much of the dissolved oxygen in water comes from the atmosphere. After dissolving at the surface, oxygen is distributed by current and turbulence. Algae and rooted aquatic plants also deliver oxygen to water through photosynthesis.
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www.fivecreeks.org/monitor/do.html
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B. Cold water can hold much more dissolved oxygen than can warm water. C. Oxygen is a gas. A molecule of oxygen is made up of two atoms, bonded (joined) together. Therefore, its chemical formula is O2. D. 21% of our atmosphere is oxygen.
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tellus.ssec.wisc.edu/outreach/teach/ideas/kotoski/Minif...
tellus.ssec.wisc.edu/outreach/teach/ideas/kotoski/Minifact_Sheets/Minifact4_Dissolved_Oxygen.pdf
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