kwizNET Subscribers, please login to turn off the Ads!
Email us to get an instant 20% discount on highly effective K-12 Math & English kwizNET Programs!

Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

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.


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

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
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!

Subscription to kwizNET Learning System offers the following benefits:

  • Unrestricted access to grade appropriate lessons, quizzes, & printable worksheets
  • Instant scoring of online quizzes
  • Progress tracking and award certificates to keep your student motivated
  • Unlimited practice with auto-generated 'WIZ MATH' quizzes
  • Child-friendly website with no advertisements
  • Choice of Math, English, Science, & Social Studies Curriculums
  • Excellent value for K-12 and ACT, SAT, & TOEFL Test Preparation
  • Get discount offers by sending an email to

Quiz Timer