2. Contents
1. Introduction of Ocean
2. Source Of Water
3. How Oceans generated?
4. Formation of ocean goes from three phases
5. Evolution of oceans
6. Divisions of Planet
3. Introduction of Ocean
• ocean is a body of
saline water that
composes much of a
planet is hydrosphere
which cover 71% of
surface of Earth.
4. Source Of Water
• 1: Comets: Comet
brought a large portion
of water on earth.
• 2: Volcanic Outgassing:
Water may also have
come from volcanic
erruptions condensing
and forming rain.
5. How Oceans generated?
• Earth is about 4.5 billion
years old but oceans are
3.8 billion years old.
• Two main theories
describing how oceans
formed.
• 1: Earth was formed with
water and that this water
come from the inside out.
• 2: Earth was dry planet
with water brought here
by other sources.
6. Formation of ocean goes from three
phases
• 1: Initially there was only
water vapour in atmosphere.
• Air and ground surface too hot
for liquid.
• 2: Cooling of atmosphere led
to condensation and rain.
• Ground surface still too hot for
pooling.
• 3: Futher cooling of ground
surface finally led to
accumulation of liquid water
on surface.
• Ocean formed 3.8 bilion years
ago.
7. Evaloution of oceans
• 180 million years ago, the
continents were united in a
single supercontinent called
Pangaea.
• Oceans were like a single
body which covered the
whole land called
Panthalassa.
• Due to plate tectonic theory
have since moved to their
present position.
• Now there are 5 major
o,ceans are present in
world.
8. Tethys Ocean
• The Tethys Ocean was
an ocean that existed
between the continents
of Gondwana and
Laurasia.
• Due to plate tectonics
movement “Tethys”
ocean disappeared.
