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Earth’s Oceans

Earth’s Oceans . World’s Oceans. 70-71% of Earth’s crust covered by ocean water 4 Major Oceans Pacific – largest and deepest Atlantic- little larger than the Indian Indian – same depth as Atlantic, but smaller Arctic – smallest and shallowest. Water Cycle.

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Earth’s Oceans

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  1. Earth’s Oceans

  2. World’s Oceans • 70-71% of Earth’s crust covered by ocean water • 4 Major Oceans • Pacific – largest and deepest • Atlantic- little larger than the Indian • Indian – same depth as Atlantic, but smaller • Arctic – smallest and shallowest

  3. Water Cycle How is the ocean the largest source of fresh water?

  4. Properties of Ocean Water • Ocean water: a mixture of dissolved gases and solids in pure water • Contains 85 of 90 naturally existing elements • 96.5% pure water; 3.5% dissolved minerals

  5. Properties of Ocean Water • Salinity – amount of dissolved salts in ocean water • expressed in ppt (parts per thousand) • # of grams of salts dissolved in 1 kg of ocean water

  6. Properties of Ocean Water • Sources of minerals - (NaCl the most common) • Volcanic activity • Erosion from land (upstream) • Waves breaking on the land

  7. Salinityis usually the same; differences result from • Precipitation, runoff, and melting sea ice and icebergs - result in lower salinity • Formation of sea-ice and evaporation – result in higher salinity

  8. Most abundant gases in ocean water • N, CO2, and O • Amount varies with depth – cold water holds more gases • Oxygen/ CO2 cycle between plants and animals same as on land

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