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The Composition of Seawater
15.1
Salinity
• The proportion of dissolved salts to pure
water, usually expressed in parts per
thousand.
Thermocline
• A layer of water in which there is a rapid
change in temperature with depth.
Density
• Mass per unit volume of a substance, usually
expressed as grams per cubic centimeters.
Pycnocline
• A layer of water in which there is a rapid
change of density with depth.
Mixed Zone
• An area of the ocean surface with uniform
temperatures created by the mixing of water
by waves, currents, and...
Key Concept
• What units are used to express the
salinity of ocean water?
–Oceanographers typically express
salinity in pa...
Key Concept
• What are the sources of salt in Ocean
Water?
–Most of the salt in seawater is sodium
chloride, common table ...
Key Concept
• What factors affect the density of
ocean water?
–Seawater density is influenced by two
main factors: salinit...
Key Concept
• What are the three main zones of
the open ocean?
–Oceanographers generally recognize a
three-layered structu...
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Earth science 15.1

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Transcript of "Earth science 15.1"

  1. 1. The Composition of Seawater 15.1
  2. 2. Salinity • The proportion of dissolved salts to pure water, usually expressed in parts per thousand.
  3. 3. Thermocline • A layer of water in which there is a rapid change in temperature with depth.
  4. 4. Density • Mass per unit volume of a substance, usually expressed as grams per cubic centimeters.
  5. 5. Pycnocline • A layer of water in which there is a rapid change of density with depth.
  6. 6. Mixed Zone • An area of the ocean surface with uniform temperatures created by the mixing of water by waves, currents, and tides.
  7. 7. Key Concept • What units are used to express the salinity of ocean water? –Oceanographers typically express salinity in parts per thousand.
  8. 8. Key Concept • What are the sources of salt in Ocean Water? –Most of the salt in seawater is sodium chloride, common table salt. Chemical weathering of rocks on the continents is one source of elements found in seawater.
  9. 9. Key Concept • What factors affect the density of ocean water? –Seawater density is influenced by two main factors: salinity and temperature.
  10. 10. Key Concept • What are the three main zones of the open ocean? –Oceanographers generally recognize a three-layered structure in most parts of the open ocean: a shallow surface mixed zone, a transition zone, and a deep zone.
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