Write Short notes on the following. All Questions are compulsory and carries 5 marks
each.

 What are coral reefs and its types? Describe the Darwin’s Subsidence Theory regarding the
formation of coral reefs.

 Discuss the different eras of Oceanographic exploration.

Two factors affecting horizontal distribution of temperature in the oceans.

Major fishing regions of the world and the importance of fish resources.

 What are tides? Differentiate between spring tides and neap tides. Discuss the equilibrium
theory regarding of the origin of tides.

Discuss the Planetesimal and Tetrahedral Hypothesis regarding the origin of continents
and oceans.