Who among the following scholars has given the Subsidence Theory relating to coral reefs ?

• Dally

• Davis

• Dutton

• Darwn 

Which one of the following regions is with high ocean water salinity ?

• Equatorial

• Polar

• Sub-tropical

• Sub-polar

Which one of the following is responsible for the greatest movements of all the tides ?

• Size of the Ocean

• Shape of the continents 

• Gravitational attraction

• Salinity of the Oceans

Which one of the following percentages of distance from the Earth surface is correct for 'perigee' of Moon than 'apogee' ?

• 2%

• 5%

• 8%

• 12%

ASSERTION (A) : The western sides of the oceans are always warmer than the eastern side.

REASON (R) : The movement of the major ocean currents is in the western side.

• Both (A) and (R) are true and (R) is the correct explanation of (A).

• Both (A) and (R) are true , but (R) is the correct explanation of (A).

• (A) is true, but (R) is false.

• (A) is false, but (R) is true.

Who among the following correlated the colour of ocean water and its salinity ?

• Al-Masudi

• Al-Maqdisi

• Ibn-Khaldun

• Ibn-Sina

Which one of the following values of temperatures is correct for the average freezing point for seawater in Arctic and Antarctic seas ?

• 2°C

• 0°C

• -2°C

• -10°C

ASSERTION (A) : The moon produces greater percentage of Earth's tides than the Sun.

REASON (R) : The Sun is closer to the Earth than the Moon.

• Both (A) and (R) are true and (R) is the correct explanation of (A).

• Both (A) and (R) are true but (R) is not the correct explanation of (A).

• (A) is true , but (R) is false.

• (A) is false , but (R) is true.

19.

The genral depth of abyssal plains varies between :

• 1000 - 6000 metres

• 2000 - 6000 metres

• 3000 - 6000 metres

• 4000 - 6000 metres

• a-3 , b-1 , c-4 , d-2

• a-4 , b-3 , c-2 , d-1

• a-1 , b-2 , c-3 , d-4

• a-2 , b-4 , c-1 , d-3