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Oceans –Facts


Mnemonic for Oceans
The first letter of each word corresponds with the first letter of an ocean

A Pool Around Islands
Arctic Pacific Antarctic Indian


The World’s Oceans
71% of the Earth’s surface is covered by ocean water.

The oceans contain 97% of the earth’s water.

All the oceans and seas are in reality one continuous
body of water.

90% of all volcanic activity occurs in the oceans.


Oceans
There are 4 oceans:

-Atlantic, Pacific, Indian.,Arctic

The Pacific Ocean is the largest ocean.


Seas
A sea is a part of an ocean that is nearly surrounded
by water.
The Mediterranean, Arctic and Black Sea are really
part of the Atlantic Ocean.


Properties of Ocean Water
Ocean water is a mixture of gases and solids dissolved
in pure water.

Oceanographers believe oceans contain all the
natural elements on Earth.

85 of 90 natural elements have been found in the
ocean.


Major Elements in the Ocean
Ocean water is 96% pure water.

Chlorine (1.9) and sodium (1.1) make up the next
largest concentration of elements.

Sodium chloride is table salt.


Salinity
 Salinity describes the amount of dissolved water in the ocean.
 Salinity is expressed in parts per thousand.
 The salinity level of the ocean is expressed in parts per thousand.
 The average salinity of ocean is 35 parts per thousand.

Sources of Salt in the Ocean
 When volcanoes erupt, rock materials and gases, such as chlorine,
spew forth.

 As rivers, streams and glaciers move over rock and soil, they dissolve
salts, such as magnesium, sodium and potassium, in them.

 As waves pound the shoreline, they dissolve salts from the rocks.


Gases in Ocean Water
The most abundant gases in ocean water are
nitrogen, carbon dioxide and oxygen.

The amounts of these elements vary with depth. They
are more abundant at the ocean’s surface where
sunlight causes more plant life.


The Pacific Ocean
• The Pacific Ocean is the largest of all the oceans.

The area and volume of the Pacific Ocean are greater than the
Atlantic and Indian combined.

• The Mariana Trench in the Pacific ocean is the deepest point in
the world, reaching a depth of 10,911 metres.

• Its name was given by a Portuguese explorer Ferdinand
Magellan , Mar Pacifico in Portuguese, meaning "peaceful sea“.

• The International Date Line passes through the Pacific Ocean .


The Pacific Ocean
• The Pacific Ocean has approximately 1/3rd of the Earth's surface

• The Pacific ocean is larger than Earth's entire landmass.

• The Pacific ocean is also the deepest of all the oceans.

• There are more than 25,000 islands in the Pacific Ocean, the
number being more than count of islands in the rest four
oceans.

• The Great Barrier Reef in Pacific Ocean, is the longest reef in
the world.


The Atlantic Ocean
Atlantic Ocean is the second largest ocean in the world.

Of all the world's oceans, Atlantic Ocean is the youngest.
It is believed to have been formed during the Jurassic
Period.

 It is one of the busiest sea routes in the Western and
Eastern Hemispheres.

The name 'Atlantic' is derived from the legendary island of
'Atlantis', as described by Plato - one of the ancient
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The Atlantic Ocean
Atlantic Ocean was the first ocean to be crossed by ship
and airplane.

The warm Gulf Stream of Atlantic Ocean keeps harbors in
the Northern Europe away from ice, during winters.

he name Atlantic comes from the Greek word
Atlantikos which was known in the English languauge at
the time, as the Sea of Atlas.

The Atlantic Ocean is the world's saltiest sea

The Indian Ocean
 Indian Ocean, the third largest saline-water body of the world, derives its
name from India
 The only ocean which derives its name from the name of a country.
 Indian Ocean is the warmest ocean in the world.
 Indian Ocean is known as 'Ratnakara' in the ancient Sanskrit literature.
Ratnakara means 'the maker (creator) of jewels'.
 its limited marine animal life which is due to higher water temperature of
this ocean.
 Waters in the Indian Ocean have one of the lowest oxygen content of the
world owing to greater evaporation rate in this ocean



The Indian Ocean
The world's only closed ocean
due to it being land locked to it's north by the
continent of Asia.
It is about half the size of the Pacific Ocean
The Indian Ocean is getting 20 cm wider every year


The Arctic Ocean
The Arctic Ocean is the smallest and shallowest
It is also the coldest of all the oceans.
The north pole is situated in the middle of the Arctic
ocean , there is no land on at the north pole, it is a floating
raft of ice.
Once called the Frozen Ocean, the Arctic Ocean is
covered with ice (2—14 ft/.6—4 m thick) throughout the
year in most of its central and western portions.
The Arctic Ocean is roughly 8% the size of the Pacific
Ocean.
During winter the Arctic Ocean is almost completely
covered in sea ice.


Best ppt on ocean facts

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Best ppt on ocean facts