Salinity of water in the polar oceans decreases because 1 Less evaporation 2 Waters from polar glaci...........

Geography World - Water Bodies

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Salinity of water in the polar oceans decreases because

1. Less evaporation

2. Waters from polar glaciers mix with ocean

3. High atmospheric pressure

4. Polar trade winds

Select the correct answer using the codes given below:

1 and 2 only

1, 3 and 4 only

1, 2 and 3 only

1, 2, 3 and 4

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Explanation:

Salinity of oceans is highest between 20 degrees to 30 degrees North and South latitudes as the rate of evaporation is very high there due to high temperature and low humidity.Temperate oceans have lesser salinity due to lower temperature and thus lower rate of evaporation. Polar waters will have even lesser salinity because of lower evaporation and continual addition of freshwater from melting icebergs.

Equatorial waters have lower than average salinity because of heavy rainfall and high relative humidity , as precipitation adds good amount of freshwater to the ocean water.