Water Quality Indicators

Secchi DiskA flat, white disc lowered into the water by a rope until it is barely visible. Measures the clarity of the water.TemperatureA measure of how hot or cold something is.Temperature rangeAquatic organisms depend on certain temperature ranges for best healthAcceptable temperature range0 to 35 degrees CelsiusPotablesuitable for drinkingSafe waterwater that is safe for bathing/cleaning, but not drinkingPhysical water quality indicatorsTurbidity and temperatureChemical water quality indicatorspH, DO, and nitrates/phosphatesBiological water quality indicatorsBioindicatorsCauses of turbiditySediments from erosion Waste discharge Algae growth Urban runoffResults of turbidityIncreased temperature and decreased DOResults in changes of pHA change in pH by 2 units results in water having 100x a difference in acidityDissolved Oxygen Levels4-5 ppm to support diverse fish populationsResults of change in DOLow DO - fish die; High DO - corrode water pipesEutrophicationexcessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.Macroinvertebratesorganisms without backbones, which are visible to the eye without the aid of a microscope.BiodiversityThe number and variety of different species in an areaWater StewardshipThe conservation, responsible use and distribution, and cleanliness of water sources across the globe.Point Source Pollutionpollution that comes from a specific siteNon Point Source Pollutionwater pollution that does not have a specific point of origin

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If the statement is true, write true. If it is false, change the underlined word or words to make the statement true.

A widow's peak is a human trait that is controlled by $\underline{\text{a single gene}}$ .

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chemistry

The table below lists the density of $O_2$ at various temperatures and at 1 atm. The normal melting point of $O_2$ is 54 K.

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astronomy

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