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
~71% of the Earth’s surface is
covered with ocean water.
All Oceans are different in volume, salt
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. 2
5 oceans in the world
History listed Seven Seas in the world
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
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.
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
Overfishing, maritime disaster – they all bring
damage to the environment caused by mankind.
As a consequence, many animals die a slow and
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
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.
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.