Oceanography and Hydrology

The Sargasso Sea is unique among major seas as it is defined by ocean currents rather than land boundaries. Located in the North Atlantic Ocean, it is surrounded by circulating currents and has no coastline, earning it the nickname 'the sea without a shore.'

Lakshadweep islands are coral atolls formed by reef formation over submerged volcanic features. Coral polyps build calcium carbonate structures around volcanic islands, which eventually erode away, leaving ring-shaped reefs and lagoons. This process creates the characteristic atoll formations seen in Lakshadweep.

The gyre of the South Atlantic Ocean is formed by the Brazil Current, the West Wind Drift, and the Benguela Current. The Canaries Current is located in the North Atlantic Ocean, so it does not contribute to the South Atlantic gyre circuit.

The Atlantic Ocean has a distinctive S-shape as it curves between the Americas on one side and Europe/Africa on the other. This unique shape results from plate tectonics and the way continents separated over millions of years.

We all know that tides are a response of mobile waters of the ocean to the pull of the moon and the more distant sun. This sentence is a reference to this theory only. Universe is very vast and 'even' stresses on the farthest point in the universe. Hence, (2) is the answer.

The Pacific Ocean is the largest and deepest ocean on Earth, covering approximately 46% of the Earth's water surface and about one-third of the total surface area. It is larger than all of Earth's landmasses combined and contains more than half of the world's free water.

The higher density of seawater provides greater buoyant force, making it easier to float. Sea water density is approximately 1025 kg/m³ compared to freshwater's 1000 kg/m³ due to dissolved salts and minerals, which increases the upward buoyant force on the body.

Dead sea   Because there is no outlet from dead sea.   The sea is called dead because its high salinity prevents macroscopic aquatic.

An atoll is a ring-shaped coral reef that encloses or nearly encloses a lagoon. Atolls form when coral reefs grow around a volcanic island that eventually sinks, leaving the reef as a circular structure. Fringing reefs grow directly from shore, while barrier reefs are separated from land by deeper water.

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.

Hydration is the process of combining with water it is usually reversible. This is not a part of the hydrological cycle.

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.