Class VII

Fluoride is also added to water, which helps prevent
  1. infections
  2. sickness
  3. fever
  4. tooth decay
Largest of all oceans on earth is
  1. Pacific
  2. Atlantic
  3. Antarctic
  4. Arctic
Water of oceans and seas is
  1. Sour
  2. Bitter
  3. Sweet
  4. Salty
Average depth of largest ocean is
  1. 1000 meters
  2. 2000 meters
  3. 3000 meters
  4. 4000 meters
Percentage of salty water is
  1. 80%
  2. 90%
  3. 95%
  4. 97%
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