Currencies have different values because the values are determined by the forces of demand and supply which varies between countries.
If there are more buyers than sellers of a certain currency, its value goes up.
The reason behind more buyers may be good economy and development of the country.
Chlorine is used to disinfect water because chlorine chemicals are very effective against bacteria, viruses and fungi that contaminate water. The process of adding chlorine to water is called water chlorination.
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Halley’s comet is famous because it is the only known short-period comet that is regularly visible to the naked eye from Earth and the only comet that might appear twice in a human lifetime. Halley last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061.
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Charles Cornwallis