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Online Quiz (Worksheet A B C D)

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Upper Elementary Science - II
3.27 Causes for Salinity of Sea Water

We are aware of the fact that seas and oceans are formed by many rivers. These rivers during their course of movement, pick up small amounts of mineral salts from the rocks and from the river-beds. During evaporation or freezing its only the water that undergoes change leaving behind the salt content. Hence salinity increases more and more.

Salinity

The salinity of ocean water varies. One cubic foot of average sea water contains 2.2 pounds of salt. Some of the salts found in the sea water are bromide, calcium, potassium, and bicarbonate. The saltiest water is in the Red Sea and in the Persian Gulf -- the reason for this is the high rate of evaporation and less rain water influx in these waters. The least salty seas are in the polar regions -- the reason for this is dissolving of salt by rain water and melting in these regions.
Directions: Answer the following questions.
Q 1: Which of these is also called 'common salt', 'table salt', or 'edible salt'?
potassium chloride
sodium chloride
sodium nitrate
ammonia

Q 2: The least salty seas are found in the
Persian Gulf
polar regions

Q 3: The water in the Red Sea is the saltiest because of high rate of
evaporation
rain water
large number of ships

Q 4: The saltiest ocean is the
Indian Ocean
Pacific Ocean
Red Sea
Arctic Ocean

Question 5: This question is available to subscribers only!

Question 6: This question is available to subscribers only!


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