Oceanography and Hydrology

According to international law (UNCLOS), the territorial waters of any country extend up to 12 nautical miles from the baseline. Within this zone, the coastal state has sovereignty over the airspace, seabed, and subsoil. The 7-mile option refers to an older cannon-shot rule, while 15 and 18 miles are not standard international measures.

A lagoon is a body of water that has a connection to the sea, typically separated from the ocean by barrier islands or reefs. Lagoons are common in coastal areas. Regular lakes are inland water bodies with no sea connection, islands are landmasses, and basins are geological depressions.

The Red Sea appears reddish due to periodic blooms of Trichodesmium erythraeum, a cyanobacteria (blue-green algae) that contains reddish-brown pigments. While sometimes called 'sea weeds,' the correct scientific classification is algae or cyanobacteria.

The hydrological cycle refers to the continuous exchange of water between the oceans, atmosphere, land surface and subsurface and the organisms. Thus, all of these are involved in the hydrological cycle.

The tides do not effect the temperature of the oceans.

No, these do not effect the salinity of the oceanic water.

This is the correct answer as all the statements are correct. The temperature-depth profile for the ocean water shows that the temperature decreases with the increasing depth. The boundary region, from where there is a rapid decrease of temperature, is called the thermocline. In the arctic and antarctic circles only one layer of cold water exists, which extends from the surface to deep ocean floor.

This is the correct answer. Salinity generally increases with depth and there is a distinct zone called the halocline, where salinity increases sharply.

This is the correct matching. The processes that the ocean undergoes are evaporation and evapotranspiration. The processes that the water in the atmosphere undergoes are condensation and precipitation. The processes that the water from the surface run-off undergoes are stream flow and freshwater storage infiltration.

Deep sea plains are gently sloping areas of the ocean basins. These plains are covered with fine-grained sediments like clay and silt. Both these statements are correct.

The shelf typically ends at a very steep slope, called the shelf break. A continental shelf is a major relief feature. This statement is incorrect.

Approximately one percent of Earth's total water is actively participating in the hydrologic cycle at any given time. The vast majority (over 97%) is saline ocean water, while most freshwater is locked in glaciers, ice caps, and groundwater. Only a small fraction circulates through evaporation, precipitation, and runoff, sustaining all terrestrial and freshwater life. This cycling portion is essential for ecosystem function and human use.

Rossby waves are large-scale atmospheric waves associated with the meandering of the jet stream in the upper atmosphere. These planetary waves play a crucial role in weather patterns by influencing the movement of air masses and the formation of high and low-pressure systems. They are not related to seismic activity, ocean currents, or small water bodies.

Ocean tides are primarily caused by the gravitational pull of the moon on Earth's oceans. The moon's gravity creates a bulge in ocean water on the side facing it. The sun also contributes but has less effect due to greater distance. Earth's daily motion affects tides but doesn't cause them.

In the intertidal zone, the most common organisms are small and most are relatively uncomplicated organisms.