Water that rises to the surface as a result of Ocean Upwelling is typically
Sea level rise at specific locations may be more or less than the global average due to many factors. Which of these factors can create differences between local sea level and global sea level?
1. Local land subsidence
2. Ocean currents
3. Variations in land height
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In an open ocean, the higher the wind speed and the longer the distance of open water across which the wind blows and waves will be:
Consider the following statements:
Assertion (A): Seamounts tend to be found on oceanic crust near mid-ocean ridges and island arcs.
Reason (R): Most seamounts are volcanic in origin.
In the context of the above, which of these is correct?
Consider the following pairs:
Trench Location
1. Tonga Pacific Ocean
2. Java Indian Ocean
3. Mindanao Deep Pacific Ocean
4. South Sandwich Atlantic Ocean
Which of the pairs given above is/are correctly matched?
Mid-Oceanic Ridges form an interconnected chain of mountain system within the ocean. It is characterised by a central rift system at the crest. The rift system at the crest is the
Consider the following statements:
Assertion (A): The level of the sea remains almost the same everywhere.
Reason (R): All the oceans of the world are interconnected with each other.
In the context of the statements above, which of these is correct?
Regarding continental shelf, consider the following statements:
1. In mountainous coasts, continental shelves are broad.
2. The continental shelf is an underwater landmass which extends from a continent.
3. The continental shelves are poor in fish resources as they are shallow.
Which of the above is/are incorrect?
Consider the following statements:
1. Continental shelf can be rich sources of fossil fuels because of the river sediment load it carries.
2. Oceanic deeps are important for the study of plate movement as they contain several active volcanoes.
Which of these is/are correct?
Hydrothermal vents in oceans are closely associated with regions of
The thermocline layer represents vertical zones of oceanic water below the first layer and is characterised by a rapid rate of decrease of temperature with increasing depth. The largest number of such layers is usually found in
A lot of interest has been recently shown in seafloor hydrothermal systems on account of their
1. High concentration of-base metals
2. High biodiversity
Which of the above is/are correct?
Regarding ocean temperatures, consider the following statements:
1. Highest temperature is observed in open seas
2. The ocean temperature decreases with depth
3. The temperature of oceans constantly reduces near the polar regions in every part of the globe
Which of the above is/are incorrect?
Increased snow cover on a water body can lead to
1. Sudden spurt in phytoplankton population which are not dependent on photosynthesis
2. Improved oxygen exchange and nutrient recycling in the lake
3. A condition of winterkill causing large scale death of fishes and organisms
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The annual range of surface temperature is much greater in the North Atlantic and North Pacific oceans than in the southern oceans. This is due to
Oceans distant from deserts or with limited accessibility to dust-carrying winds from deserts often have limited primary productivity. This is due to
Concerning ocean salinity, consider the following statements:
1. In oceans, sodium chloride alone constitutes 95% of ocean salts.
2. The proportion of ocean salts vary in different parts of the ocean.
3. The salinity is constant throughout the oceans.
Which of the above is/correct?
Which of the following statements about ocean salinity is/are correct?
1. The salinity of water in the surface layer of oceans depends mainly on evaporation and precipitation.
2. Surface salinity is greatly influenced in coastal regions by the freshwater flow from rivers, and in polar regions by the processes of freezing and thawing of ice.
3. Wind also influences the salinity of an area by transferring water to other areas.
4. The ocean currents have a negligible role in affecting ocean salinity.
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179 videos|475 docs|221 tests
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