The water cycle transports a plethera of microorganisms, and many of them are harmful for human beings. These include bacteria, protozoa, viruses, and lavae of high-ordered parasytes. Some of the aforementioned are Giardia, Cyptospordium, Shigella, E. coli, hepatitis A virus, and enterovirus.
Waters can also carry chemical wastes such as pesticides, and heavy metals dissolved in them. It is common to hear about acid rain as a result of pollution, and it originates as a result of mixing sulphur dioxide and nitrogen oxide with water molecules in the atmosphere.
There are several technological improvements over the past 100 years that have made the availability of clean water to communities a lot easier, and not only depend on boiling water. Filtration is the most common practice, it traps most unwanted particles and microorganisms, but it should be accompanied with chemical disinfection, which uses halogens to oxidize essential celluar structures and enzymes. In the present, chemical disinfection can even be achieved with adding a pill to a specific volume of water.
Answer:
BIRTH RATE: The number of people being born per year
DEATH RATE: The number of people dying per year
TOTAL FERTILITY RATE: The fertility rate at a given age is the number of children born alive to women of that age during the year as a proportion of the average annual population of women of the same age.
INFANT MORTALITY RATE: The number of infants dying each year
LIFE EXPECTANCY: the average period that a person may expect to live
Explanation:
D:low income because its not that high of a country
A chemical property of a mineral is evident if the mineral B, bubbles when acid is placed on it.
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