Identify the correct statement regarding variation in density of ocean water and air at the same temperature :

• Ocean water is 800 times more denser than air.

• Ocean water is 600 times more denser than air.

• Ocean water is 400 times more denser than air.

• Ocean water is 200 times more denser than air.

• a-4 , b-2 , c-1, d-3

• a-2 , b-4 , c-1 , d-3

• a-2 , b-4 , c-3 , d-1

• a-3 , b-4 , c-2 , d-1

Which one of the following countries is devoid of Glossopteris flora ?

• India

• Australia

• Norway

• South Africa

• a-3 , b-4 , c-2 , d-1

• a-3 , b-4 , c-1 , d-2

• a-4 , b-3 , c-2 , d-1

• a-1 , b-4 , c-2 , d-3

Which one of the following is the correct average slope angle of continental slope ?°

• 2° 

• 4°

• 6°

• 8°

Which one of the following is the main chemical composition of coral reefs ?

• MgCO₃ (Magnesium Carbonate)

• KCO₃ (Potassium Carbonate)

• NaCl (Sodium Chloride)

• CaCO₃ (Calcium Carbonate)

The coral reefs that are generally found attached to the shore with an intervening shallow channel or a lagoon is called 

• Barrier reef

• Patch reef

• Ribbon reef

• Fringing reef

The term "Swash" refers to :

• Backward movement of sea water at the beach after the breaking of a wave.

• Oblique movement of sea water at the beach after breaking of a wave.

• Forward movement of sea water up the beach after the breaking of a wave.

• Sideward movement of sea water up the beach after the breaking of a wave.

Identify the correct statement pertaining to the Mid-Atlantic Ridge from the floor of Atlantic Ocean among the following :

• Almost 3 km above

• Almost 4 km above

• Almost 5 km above

• Almost 6 km above

ASSERTION (A) : Coral reefs to be most extensively developed along the eastern edges of continents.

REASON (R) : Sea water is warmer than 20°C.

• 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.