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The Ocean. Ocean Water (ch. 17.1). We depend on ocean for: Food & resources Acts as barrier between continents. Origin of Oceans. 4 billion years ago, Earth was full of volcanoes that released CO 2 , hydrogen, water vapor, and other gases into atmosphere.

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ocean water ch 17 1
Ocean Water (ch. 17.1)
  • We depend on ocean for:
    • Food & resources
    • Acts as barrier between continents
origin of oceans
Origin of Oceans
  • 4 billion years ago, Earth was full of volcanoes that released CO2, hydrogen, water vapor, and other gases into atmosphere.
  • Lots of water vapor built up in the atmosphere, cooled, and condensed into storm clouds.
  • Oceans were formed when precipitation filled low areas on Earth called basins.
composition of ocean
Composition of Ocean
  • 70% of water on Earth is ocean water.
  • Salt comes from dissolved elements (Cl, Na) from rocks and minerals in rivers and groundwater.
  • Salinity- measures the amount of salt dissolved in seawater.
  • Every 1000 L of ocean water contains 3.5% or 35 L of dissolved salts.
  • Salinity of ocean remains balanced since substances are being used and brought in.
ocean currents ch 17 2
Ocean Currents (ch. 17.2)
  • Current- mass movement or flow of ocean water
  • Surface currents- moves water parallel to Earth’s surface caused by winds.
    • Only moves upper seawater
factors that influence surface currents
Factors that influence surface currents:
  • Coriolis Effect- spin of Earth deflects water
  • Continents deflect currents as they hit land
  • Other factors:
    • Wind
    • Gravity
    • Solar heating
importance of surface currents
Importance of surface currents:
  • Warm ocean water comes from equator
  • Heat moving from warm ocean water transfers energy into atmosphere, thus, influencing and affecting climate.
  • Waters on west coasts of continents are colder because currents originate from poles.
  • Currents on eastern coasts of continents originate from the equator.
slide9
Upwelling- circulation in the ocean that brings up deep cold water from bottom to surface
  • Concentrated cold water brings food and nutrients from bottom to top