Earths Oceans

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Earths Oceans

• Pull out some paper for notes

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Earths Oceans

• What is the biggest difference between Earth and
  Marsor Mercury?
• Oceans! 71 of the earth is covered by oceans.
• These oceans greatly regulate the environment.

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Divisions of the Global Ocean

• The largest Ocean Is the Pacific Ocean.
• The Atlantic is about ½ the size of the Pacific.
• The others areIndian OceanArctic
  OceanSouthern Ocean

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How did the Oceans form?

• Recall that the Continents move about around the
  globe and have changed the oceans greatly.

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How did the Oceans form?

• About 4.5 Billion years ago, there were no
  oceans.
• As the earth Cooled, Water condensed out of the
  atmosphere and rain filled the first oceans.

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Characteristics of Ocean Water

• Ocean Water is Salty 85 of the dissolved solids
  are Sodium and Chlorine Ions (Salt)
• This comes from the water cycle. Rain falls on
  the continent, dissolves salt, and deposits it in
  the ocean.

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Climate Effects Salinity

• Some parts of the ocean have more salt than
  others.
• Warmer Drier climates Higher Salinity.
• Cooler Wetter climates Lower Salinity
• The Temperature effects evaporation rates.

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Water Movement Effects Salinity

• Where rivers run into the ocean also makes lower
  salinity conditions.
• Ocean currents can change salinity.
• The presence of bays that let water stand can
  increase salinity too.

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Temperature Zones

• Temperature of the water decreases with depth.
• Surface Zone Temp drops slowly near the surface
• Thermocline Temp drops sharply
• Deep Zone Temperature steadies at its coldest
  temperature.

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The Ocean Water Cycle

• Evaporation Water moves off the ocean.
• Condensation Clouds form and move over the
  continents.
• Precipitation Rain and Snow falls, eventually
  running down rivers to the ocean.
• The cycle repeats.

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The Global Thermostat

• Water can hold allot of heat.
• Water is slow to change temperature, as compared
  to land.
• Because of this the earths temperature is
  regulated.
• Without this the earth could vary between 100C in
  the day and -100C at night.

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• End

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Exit Ticket

• What are the three parts of the water cycle?