OCENOGRAPHY • Study of ocean science is known as oceanography

• Formally began with British expedition in 1873-1876 successful deep sea expedition

ROLE OF OCEANS

Supply water vapour for rain

Connects continents and island

Provides large number of minerals deep under the

ocean

OCEANS DEEP

DEEPESET IN THE WORLD ABOUT 10,800 m BELOW MEAN SEA LEVEL WHERE AS Mt. Everest is about

8,848 M Above MSL

Other major trenches of the world

Also known as MINDANAO TRENCH

10,668 m

THE EARTH’S OCEANS

PACIFIC

ATLANTIC

INDIAN

ARTIC

THE SOUTHERN OCEAN

PACIFIC

FERDINAND MAGELLAN FIRST PERSON TO CIRCUMNAVIGATED

AND NAMED CALM AND PEACEFUL

Largest and deepest ocean in the world occupies 1/3 of total area

Formed 250-300 million years ago

Islands in this oceans are mostly volcanic origin

Beset by typhoons and hurricanes

Pacific ocean is shrinking as continents move

FORMED DUE TO TECTONIC FORCES WHICH

SPLIT UP GONDWANA LAND

ATLANTIC OCEAN NAMED AFTER THE ATLAS THE

TITAN GAINT

Second largest ocean and occupies 1/6 of total area

Commercial highway between Europe and USA

Highly intended (planned) coastline and longest coast line

Most striking features is the raise of longitudinal line known as MID ATLANTIC RIDGE

TWO TYPES OF ISLAND

ARE FOUND

Continental origin

British isles

Newfoundland

Volcanic originCuba, Jamaica

Rico

Indian Ocean

Deeper then Atlantic ocean

Northern part of ocean is considered to be very important in terms of trade

TWO TYPES OF ISLAND

ARE FOUND

Continental origin

Sri lanka

Madagascar

Volcanic originAndaman , Maldives , Mauritius