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O C E A N S

B I G G E S T S E A S I N T H E W O R L D

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~71% of the Earth’s surface is covered with ocean water.

All Oceans are different in volume, salt content,

waves and flow.

 

On average, seawater in the world's oceans has a salinity of about 3.5%. This means that

every kilogram of seawater contains approximately 35 grams of dissolved salts.

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5 oceans in the world

Arctic Ocean

Antarctic Ocean

Atlantic Ocean

Indian Ocean

Pacific Ocean

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History listed Seven Seas in the world

Pacific Ocean

Atlantic Ocean

Indian Ocean

Caribbean Sea

Mediterranean Sea

Yellow Sea

North Sea

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The economic importance of the oceans

The sea provides us with food and living space along every coast.

Commercial, recreational and subsistence fisheries bring in many millions of pounds of fish -and dollars- each year to coastal communities and even for all states. People also use the ocean and shoreline for boating, sightseeing, vacationing, and other recreational activities.

It is still the major means for transporting goods internationally (92% of all goods)and many cities rely on their ports as a major subsistence and the seas are therefore one of the biggest employers.

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The ecological importance of the oceans

Today, the ocean contains an amazing array of life at every depth. Over 1 million known species of plants and animals live there, and scientists say there might be as many as 9 million species we haven't discovered yet.

Unfortunately, the global warming heats the oceans and for this reason the world's oceans are becoming acidic at a faster rate than at any time in the last 65 million years. This all happened because of redundant human co2.

The animals in the seas are in danger. Many of them need calcium carbonates for living and the acid dissolves the calcium carbonate in the sea water.

Overfishing, maritime disaster – they all bring damage to the environment caused by mankind. As a consequence, many animals die a slow and agonizing death.

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Deepwater Horizon Explosion

Deepwater Horizon was an offshore

oil drilling rig which sank on 20th April

2010 as a result of an explosion.

This event started a massive

offshore oil spill in the Gulf of Mexico

which is now considered as one of

the largest environmental disasters

in history.

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Consequences of the explosion

It is estimated that the leak released about 185 million gallons which is 700,225,000

litres of crude oil. The majority of the oil is still in the ocean but cannot be seen as it

is underwater. One of the largest oil plumes detected in the deep waters of the Gulf

of Mexico was as large as 16km long, 5km wide and 91m thick in spots. And there

are still many of these kinds of plumes.

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Consequences for nature

The spill caused extensive damage to marine and wildlife habitats as well as

the Gulf’s fishing and tourism industries as you can see from these pictures.

Imagine how these poor birds must have felt. But there are also many other

animals at risk like turtles, dolphins, whales,… just to name a few.

In general, the consequences are devastating for all living creatures and it will

take ages for the whole area to recover.

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Thank you very much for your attention!