Population growth is the increase in the number of individuals in a population.
The quartz is more resistant to abrasion and chemically more resistant than the feldspar. The result is that the quartz remains in the stream but the feldspar breaks down to clay or is dissolved.
(this is from coursehero.com)
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I'm fairly sure the organization is the RCREEE.
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Untouchables - Considered subhuman, did worst possible work.
Untouchables exist outside the caste system of the Hindu religion because they are considered so low that some think them subhuman. As a result they are regularly subjected to abuse but there have been efforts to change their situation in recent years.
Brahmin - Priests and learned people.
This is the highest caste/ verna and consists of Priests, Advisors and learned people.
Shudra - Peasants and laborers
This is the lowest/ fourth caste and as seen, consists of Peasants and laborers. They do the menial work.
Vaishya - Farmers and merchants
This is the third highest caste/ verna. Consists of Farmers, traders and merchants.