|
Ocean the body of salt water which covers about 71%
of the earth's surface. In reality, there is only one ocean; the geographical
subdivisions such as Pacific, Atlantic, Indian, Arctic and Antarctic oceans
are all made for convenience. They are all interconnected. In terms of
water depth, ocean zones having a depth deeper than 200m are considered
as open ocean and shallow coastal zones lying over continental shelves,
usually less than 200m deep, are called neritic zones. The neritic zones
or the shallow coastal waters are more influenced by changes in hydro-meteorological
conditions like sedimentation, water movements, salinity and temperature.
The shallow waters are rich in nutrients, hence more productive and supports
a wide range of marine life than the deeper oceanic zones. The
bay of bengal is a part of the Indian Ocean, notoriously famous
for the origin of tropical cyclones,
which affect Bangladesh and adjacent parts of the subcontinent. However,
the Bay of Bengal is also a place of blessing for the origin of the southwest
monsoon
wind, which brings enormous precipitation to the region. [Mohd Shamsul
Alam] |
