General Physica...

Consider the following statements with reference to the continental shelf:
1. It is submerged in water. 
2. Its average depth is 100 fathoms.
3. Its higher percentage is found in the Pacific ocean.
4. It is wider, where high mountains are close and parallel to the coast.
Which of the statements given above is/are correct?

Waves often change direction as they approach a shoreline, a phenomenon known as ____________.

With respect to thermocline, choose the correct statement:
1. Layer in which temperature changes more rapidly than it does in layers above as below.
2. It depends upon season, latitude and turbulent mixing by wind.
3. It may be semi-permanent feature of body of water in which they occur.

Thermohaline is a part of large scale ocean circulation around the earth. Choose correct statements:
1. It is driven by density gradient.
2. It includes both the processes of sinking and upwelling of waters.
3. State of circulation has large impact on climate of Earth.
4. It is sometimes called ocean conveyor belt or meridional overturning circulation.

Identify the wrong pair.

The coral reefs are the marine counterparts of __________.

Which of the following factors affects the origin and nature of movement of ocean current?

Which of the following conditions hinders the development of corals?

Which among the following statements about the North Atlantic Drift is/are correct?
1. It keeps the West coast of Northern Europe ice free.
2. It is responsible for the warm air mass which interacts with the cold air mass from the Polar region and causes rainfall in Western Europe.
3. It meets the Labrador current near Vancouver Island and causes dense fog.

The acidification of oceans is increasing. Why is this phenomenon a cause of concern?