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:
i think is A
A. Ancient artifacts found in Mayan Temple reveal what life was like for the wealthy Mayans
Answer:
It is more reliable.
Explanation:
A primary source is an immediate firsthand account while a secondary source is a source from someone who wasn't right there normally.
Kelvin lowered his prediction to 20 million years based on fresh data on the granite melting point.
<h3>What did Lord Kelvin believe about the Earth?</h3>
The Earth, according to Kelvin's theory, solidified from a molten state in which it was first all at a high temperature that was then maintained at a constant surface temperature.
<h3>How did Lord Kelvin calculate the Earth's age?</h3>
Using temperature gradients, Kelvin computed the age of the Earth and calculated that it was approximately 100 million years old. He was unaware that the Earth's mantle was convecting, which rendered his prediction inaccurate.
<h3>What was Lord Kelvin's theory?</h3>
According to Kelvin's law, heat from a high-temperature energy source cannot completely be transformed into "work." A portion of the heat will be transformed into poor energy and "lost" in the process. This demonstrated that a heat engine cannot be completely efficient.
To learn more about Lord Kelvin's theory visit:
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