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 More than
two thirds of earth’s surface is covered with water. The earth’s five oceans
and its seas, rivers that comes from rainfall, from snow and ice melting.not forgetting the lakes and ground water even swamps. They
are all connected to present the aquatic area which is a home of huge number of
living things.

The water is very effective and important
molecule for all organism and it is essential part in life. Most of the
organisms cannot survive without the presence of water. Although, they don’t live inside it such as
human and plants and different organisms, they have provided with food from
inside it, also passengers and goods are often carried by sea.

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An aquatic ecosystem
is a community of living organisms socializing with each other and their surroundings
under the water. There are two main kinds of
aquatic ecosystems called saltwater ecosystem and freshwater

Wet lands are areas that are permantly or regularly under
fresh or salty water, such as bonds, rivers, bogs, marshes, estuaries and
mangrove swamps.

While the open
ocean starts at the edge of continental shelf where the seabed plunges suddenly
down the continental slope to greater depths. Its divided into three zones: the
benthic zone is at the bottom, above that the demersal zone, and the pelagic
zone is uppermost.

Ocean currents
are driven by a combination of winds and the earth’s rotation, and they are regulating
permanent or continuous movement of ocean’s
water. The motion of the ocean water is
promoted by forces acting on the water counting the breaking waves, salinity
differences, Coriolis effects, the wind and temperatures

While ocean surface
currents are like large rivers many kilometers wide, on average 100m deep and flowing
at 15 km per hour. also it affect only the top 100m so the ocean deep current
involve the whole ocean

 However, the major currents are spilt on
either side of equator into huge rings called gyres.

This essay is
concentrating on comparing between fresh and salt water and the features that
include each ecosystem.


Plus on that
it will include the types of Ocean currents and their effects in order to work
to neutralize the temperature difference between different areas in the oceans
such the winds do on land. As a body of water warms and cools slowly it’s an
excellent, and fairly stable, transmitter of heat and cold which feeds into the
weather system. 

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