Oceanography and Hydrology

Sea breeze occurs when winds blow from the sea toward coastal areas, typically during daytime when land heats up faster than water. This temperature difference creates lower pressure over land, drawing cool air from the sea.

Ocean water moves both horizontally through surface currents driven by wind and density differences, and vertically through upwelling and downwelling processes. This complex circulation system includes thermohaline circulation that moves water between surface and deep ocean layers.

Ocean acidification is the name given to the ongoing decrease in the pH of the Earth's oceans, caused by the uptake of anthropogenic carbon dioxide (CO₂₎ from the atmosphere. About 30–40% of the carbon dioxide released by humans into the atmosphere dissolves into the oceans, rivers and lakes.

Tides are caused by the gravitational pull of BOTH the sun and moon on Earth's surface, including the oceans. While the moon's influence is stronger (about twice as much as the sun's) due to its proximity, both celestial bodies contribute to tidal forces. The gravitational pull creates tidal bulges on both sides of Earth, leading to high and low tides. The sun's gravitational pull definitely affects seawater, not just land.

Red tides are unrelated to movements of the tides.They are not necessarily red and many have no discoloration at all.They are

Fathoms are a traditional nautical unit specifically used for measuring water depth. One fathom equals 6 feet. Miles, meters, and nautical miles measure distance but are not the specific term for sea depth measurement.

Water is present as marine water or fresh water. Marine water is that which consists of large amounts of salts and minerals thus known as saline water. Freshwater does not consist of salts. Rivers, ponds and lakes are freshwater sources and ocean is a source of marine water.

About 71% of the earth’s surface is covered with water which is present in various water bodies like rivers, oceans, seas, canals, lakes, etc. Oceans cover the major part of the earth.

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.

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.