origin of ocean basins

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Origin Of Ocean Basins

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Page 1: Origin Of Ocean Basins

Origin Of Ocean Basins

Page 2: 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

Page 3: Origin Of Ocean Basins

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.

Page 4: Origin Of Ocean Basins

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.

Page 5: Origin Of Ocean Basins

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.

Page 6: Origin Of Ocean Basins

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.

Page 7: Origin Of Ocean Basins

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.

Page 8: Origin Of Ocean Basins

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.

Page 9: Origin Of Ocean Basins

Divisions of Planet

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

Page 10: Origin Of Ocean Basins

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