In Rural Society, we have already seen that there is a good deal of unemployment. This removal of unemployment is necessary for the prosperity of the national. For this the following steps have to be taken:
There are four major elements of the environment. They are air, water, land and sound (noise). When all the four elements become polluted, the environment automatically becomes polluted, in other words, degraded.
Demand for a good by an individual market as a whole is conventionally expressed in three alternative forms i.e. a demand function, a demand schedule and a demand curve.
Some of the ways to control pollution caused by Automobiles are- Vehicles should be properly tuned so that hydrocarbons are completely burnt. This would reduce the pollution due to hydrocarbons. Air filters should be regularly cleaned and air-fuel ratio should be properly adjusted so that sufficient oxygen is available for combustion of hydrocarbons (gasoline or diesel). This would reduce CO and hydrocarbons in the exhaust gases.
Refining of metals means purification of metals. Depending upon the nature of the metal and the nature of the impurities, present different methods are applied for the refining of metals. Some of the commonly used methods are discussed below: