Introduction to the Oceans

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13 1 Intro to Oceanography
13:58 — by SPMSEarthSci

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Key Questions

  • Answer:

    Intertidal, Neritic, Open-Ocean.

    Explanation:

    Intertidal zone lies between the low- and high- tide lines. (most changeable zone in the ocean)

    Neritic zone extend from low-tide line to the end of the continental shelf.

    Open-Ocean has two subzones. The Bathyal zone and the Abyssal zone.

  • Surface and under currents in oceans are due to changes in

    temperature and density that are attributed to climatic changes.

    So, local salinity might change with climate.

    On the average, ocean salinity is the intolerable ( from wiki ) 35

    gm/liter.

  • Thermocline is the layer in between 'Mixed Layer' and 'Deep Water Layer' in oceans, lakes etc or even in our atmosphere.

    Now split that word- thermo: meaning heat and 'cline': derived from decline. This is a transition layer in the middle where the temperature of the water declines with the increase in depth.
    The 'mixed layer' being closer to the surface has a temperature of 30-35° C and extend till 300-400m.
    Within 'thermocline layer' the temperature drastically falls from 30-35° C to 4°C.
    Below 'thermocline layer', we get 'deep water layer' where the temperature of water stays at 4°C.

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