origin of ocean basins

Origin Of Ocean Basins

Contents1. Introduction of Ocean2. Source Of Water3. How Oceans generated?4. Formation of ocean goes from three phases5. Evolution of oceans6. Divisions of Planet

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.

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.

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.

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.

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.

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.

Divisions of Planet

• 1: Pacific Ocean• 2: Atlantic Ocean• 3: Indian Ocean• 4: Arctic Ocean• 5: Antarctic Ocean

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