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There are two main sources of pollution:
(1). Natural Sources:
(a) Volcanic ash
(b) Marsh gas (CH4) released from decay of organic matter.
(c) Dust from dust storm.
(d) Pollengrains, spors, bacteria, cysts etc.
(2). Anthropogenic sources:
Man has aggravated the problem of pollution by his innumerable activities like.
(a) Industrialization
(b) Revolution in automobile industry
(c) Deforestation
(d) Nuclear explosion
(e) Over exploitation of natural resources.
SOIL TEXTURE AND STRUCTURE We have seen that soils are predominantly composed of particles of various sizes derived from the disintegration or decomposition of parent rock materi
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