Ans. Land Pollution
Land (soil) is an important resource as it is the basis for the growth of producers. In the recent times, soil has been subjected to pollution.
Sources of Land Pollution
i) The pesticides used" in agriculture have chemicals that stay in soil for long times, ii) The acid rains change the pH of soil making it unsuitable for cultivation.
iii) The household and other city garbage lies scattered in soil in the absence of a proper disposal system.
iv) Materials like polythene block the passage of water into soil and so decrease-the water- holding capacity of soil,
v) Many industries produce harmful chemicals which are disposed of without being treated.
vi) Improper disposal of nuclear wastes also cause radioactive substances to remain in soil for a long time,
vii) Open latrines in villages and some parts of cities are also the source of land pollution.
Control of Land Pollution
i) There should be suitable and safe disposal of wastes including nuclear wastes.
ii) Non-biodegradable materials like plastic, glass, metals etc. should be recovered and recycled.
iii) Inorganic pesticides should be replaced by organic pesticides.