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Essay/Term paper: The ocean

Essay, term paper, research paper:  World History

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The Ocean


The world's ocean covers about 70% of the Earth's surface. It is use to produce
us many things. It is more than a place to swimming, sailing and other
recreation. The ocean serves as a source of energy, raw materials and most of
all food like fish and seaweed. In this essay I will talk about "What are our
ocean resources and the importance of the oceans in the future."

First, our largest resource in the ocean is food. There are two different kinds
of food in the ocean, such as marine plants and marine animals. These two kinds
of resources are reborn resources and it will never be end. For marine plants we
have the algae's family, like seaweed. During ebb tide, you can find the seaweed
between rocks. For the marine animals we have fish and shrimp. The fish and
shrimp are always moving around the ocean and follow the ocean currents.

What is ocean current? It is a movement of ocean thatcan buring the fish to
other places. There are two kinds of circulation create the currents in the
ocean. They are (1) wind-driven circulation and (2) Thermohaline circulation.
Wind-driven circulation result from the wind sets the surface waters into motion
as currents. The currents generally flow horizontally-that is parallel to the
earth¡¦s surface. The wind mainly affects only the upper 100 to 200 meters of
water. However, the flow of wind-driven currents may extend to depths of 1,000
meters or more.

Thermohaline circulation produces great vertical currents' hat flow from the
surface to the ocean bottom and back. The currents largely result from
differences in water temperature and salinity. The currents move sluggishly from
the polar regions, along the sea floor, and back to the surface. In the polar
regions, The surface waters become colder and saltier. Being colder and saltier
makes these waters heavier, and they gradually flow back toward the surface and
replace the surface waters that sink. For example, as a warm ocean current and a
cold ocean current meet together, The warm water will always follow cold water
and moving around the ocean. The most important is the plankton does not like to
stay in the cold place. They will follow the warm current. As the result the
small fish like shrimp that eats plankton, will follow the plankton. Similarly
the bigger fish that eats small fish and shrimp will just follow also and these
fishes became a chain.

Our ocean has produced raw material also. Like natural gas and petroleum. These
materials are all unaltered. After you have take them out, you need to use
machine to take out the dirt. For example the petroleum is use to sucked out by
the big pipes. The asphalt road and the clean oil can be the fuel. South china
sea has a big processing plant that produces the oil and natural gas. In late
1980¡¦s, offshore wells produced about 25 percent of the world¡¦s oil and about
20 per cent of the world¡¦s gas. Scientists estimate that 3 trillion barrels of
oil lie undiscovered beneath the ocean. Equally huge amounts of untapped gas
accompany the oil. As gas and oil reserves on land are use up or become too
difficult and expensive to obtain, finding and recovering undersea deposits will
become increasingly important.

The ocean can be use to produce power. First, we have wave power. Generator was
built in the ocean. It has a pumping chamber. It will move up and down to turn
the generator. Second, we have tidal power. The generator will have to build on
the place were water will falls. The best place is to built it on a dam. Once
the dam is full, the water will rush down and it will turn the generator to
produce the energy.

Our ocean is very useful, but we are the one that endangers it with pollution.
The most common pollution is trash and the chemical waste. People go to sea to
fish or to swim they always leave trashes like cans and plastic bag. These
things are not easy to dissolve and if we put them together, oh my god can you
image? That will be like a small mountain every day.

The next common pollution is the chemical waste (sewage). This pollution is
always coming from factories, household and human. That can poison the
environment and also contains bacteria, viruses and parasite eggs. That is
harmful to human health. The bacteria can give swimmers' stomach upsets or
infections. It is liquid and easy to dispersed through out the water and marines
lie than it is hard to wash it out anymore. The north sea is one of the most
polluted seas in the world. Rivers from the industrial countries of western and
central Europe will flow into the southern part of the north sea. The sewage can
dissolve by small bacteria¡¦s but needs long time. In many places, sewageses are
left before it is disposed. It can be treated to make it safer but this is
expensive.

The next pollution is the spill out oil. I think most of people have heard about
it. But where is it come from? Now is our ocean there were many tankers are
sending oil to other countries or to their own country. Sometimes the tanker
might hit the ice or mountain under the sea. And then the oil will come out from
the hole. Oil is very dangerous to the environment, especially marine animal and
sea birds. Once the oil is on marine animals' body, their body will have hard
time to breathe and then they will die. For example, whales are using lung to
breathe. They need to float over the water to breathe, so they need to float
over water to breathe every period. If they suck in the oil they will be sick
and die. Also the birds, if the oil is on their body they cannot keep warmness
and they will die because of cold or they will swallow it in when they try to
clean it with their mouth.

On March 24 1989. The oil tanker exxan valdez van aground in Prince William
Sound in Alaska. It spilled over 11 million gallons of crude oil. The effect on
the land environment was killed in huge numbers. Offers are poisoned by oil,
Ether by swallowing it as they swim through it or by trying to lick it off their
coats. However, the main cause of death is exposure too cold. If oil clogs
otters fur they freeze to death, then few of these sea attars have cleaned. But
about 3,000 along with 36,000 seabirds and over 100 eagles are estimated to have
died.

Change salt water to clean water is very easy. The scientists invent a machine
which can change the salt water to clean water. First, you have to boil the salt
water and wait until the salt water become steam then the salt will be left in
the container and wait or the steam become clean water.

Water is the most critical natural resources in the year 2,000. According to
"Thors, orig. Water spells lie itself. It's used in agriculture, domestic taps
and industry. Not only in food production, drinking and business. If we don¡¦t
protect it well, in the future it is hard to change the salt water to clean
water, then we will not have clean water to drink, to plant and to agriculture.


 

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