Answer» - While most of the sunrays radiate back from the surface of the sea, some of them penetrate to certain depths in the water.
- As a result, the intensity of sunrays decreases with the increasing depth.
- The temperature decreases up to 2000m depth.
- After 2000m, the temperature of the seawater is uniform everywhere.
- It is around 4°C everywhere from the equatorial regions to the polar areas.
- Temperature reduces only up to 4° C according to depth, and therefore, the water at greater depths does not freeze.
- The temperature of the seawater changes rapidly with depth at the equatorial areas. The difference in temperature is lesser in polar areas.
- There is also a difference in open seas and landlocked seas. In low latitudes, because the salinity of the landlocked seas is more, the temperature of the landlocked seas is higher than the open seas.
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