Digitalcracy

Q.”Temperature,salinity and density differences in ocean water are the prime causes of ocean water circulation.” elaborate (30/11) Q. How atmospheric conditions influence and control ocean water circulation.(Self) The general movement of a mass of oceanic water in a definite direction is called ocean current which is more or less similar to water streams (rivers) flowing on the land surface of the earth. CONTROLLING FACTORS 1.Factors related to the rotation of the earth Rotation of earth creates coriolis force which deflects the general direction of ocean currents. 2.Factors related to the oceans a.Temperature difference: High temperature in the equatorial region results in expansion of water particles due to which water density decreases .Similarly, in polar areas due to low temperature water density increases. Thus, due to expansion of volume, water moves from equatorial region to polar region. There is movement of ocean water below the water surf...

Q.Describe the characteristics of different types of pelagic deposits (10/15 ). Q.Write short note on oceanic deposits (10/15). Q.Write short note: pelagic deposits ( 20/04) Q.Discuss the different bases for classifying the ocean deposits and give a detailed    account of pelagic deposits of the ocean.(60/07) It refers to unconsolidated sediments derived from various sources deposited at the seafloor. TYPES(Based on sources) 1.Terrigenous Materials Gravel Sand   Silt   Clay   Mud: Murray divided it into 3 based on color Blue Mud:Includes the materials derived from the disintegration of Rock rich in iron sulphide and organic matter. Predominantly present in Atlantic Ocean, Mediterranean sea and Arctic sea. Red mud:Includes material derived from rocks rich in iron oxide s;confined mostly to yellow sea, brazilian coast and floors of the Atlantic Ocean. Green mud: It is formed from the Blue mud due to chemic...

Q. Give an account of recent observations on Coral bleaching with reference to Clive Wilkinson’s report.(15/14) Q. Compare the subsidence and glacial control theories on the formation of coral reefs.(25/13) Q.”Atolls present the most challenging explanation in the evolution of coral reefs”. Discuss (20/12) Q.Describe the ideal conditions for coral reef formation and discuss the glacial Control theory of coral reef formation.(60/08 ) Q. Write short note:formation of coral reefs. (20/01) Coral reefs and atolls are submarine features formed due to accumulation and compaction of skeletons of lime secreting organisms known as coral polyps.Coral reefs are also known as rainforest of the oceans as they are more diverse than the tropical rainforests. CONDITIONS FOR GROWTH Depth: Grow in shallow waters; .cannot grow  deeper than 62-77 m below sea level as they will not get sufficient amount of Sunlight and oxygen. Temperature: They require high average annual t...