Natural Hazards and Disasters

Tsunamis are most commonly produced by submarine earthquakes that suddenly displace large volumes of water. While tides, cyclones, and crustal shrinking can affect ocean water, they do not generate the massive, fast-moving waves characteristic of tsunamis.

The Indian Ocean experiences cyclones most frequently. Cyclone is the regional term for tropical cyclones in the Indian Ocean, while Hurricane (Atlantic), Typhoon (Northwest Pacific), and Tornadoes (land-based) occur less frequently in this region.

Tsunamis are primarily caused by undersea earthquakes that displace large volumes of water, creating massive waves. They can also be triggered by volcanic eruptions, landslides, and meteorite impacts, but earthquakes are the most common cause. Winds cause normal waves, not tsunamis.

Down draughts are downward-moving air currents that can cause various weather phenomena. Squalls are sudden strong winds, microbursts are small-scale intense downdrafts, and gusts are brief increases in wind speed. All are caused by down draughts in thunderstorms.

This is the correct option. All these statements are excellent ways of protecting our property from damage during an earthquake.

The energy that intensifies the storm, comes from the condensation process in the towering cumulonimbus clouds, surrounding the centre of the storm. This statement is incorrect.

The term epicenter specifically refers to the point on Earth's surface directly above the origin (focus) of an earthquake. The prefix 'epi-' means 'on' or 'above', so epicenter is the surface point above the earthquake's underground starting point. It is not related to nuclear explosions, cyclonic storms, or other phenomena in this context.

Hanging valleys are formed when a smaller tributary glacier carves a U-shaped valley that is shallower than the main valley carved by a larger glacier. When the glaciers retreat, the tributary valley 'hangs' above the main valley, often creating spectacular waterfalls. Rivers, waves, and volcanic activity do not create this distinctive glacial landform.

Mangroves are salt-tolerant trees that grow along coastal areas and form dense natural barriers that significantly reduce cyclone impact. While 'shelter belts' and 'wind breaks' are similar concepts for inland areas, mangroves are specifically the coastal vegetation ecosystem. The term 'protection forests' is too general.

This is the correct option, as this is not a consequence of floods. The ground water level, infact rises due to floods as more water is seeped into the ground. 

Cyclone Nargis devastated Myanmar in May 2008, causing widespread destruction in the Irrawaddy Delta region and significant loss of life. Katrina affected the USA in 2005, while Reena and Hema are not names of major tropical cyclones in this context.

A tsunami is a series of large ocean waves caused by underwater earthquakes, volcanic eruptions, or landslides. The term comes from Japanese meaning 'harbor wave'. It is not a small island, cushion-shaped land, or cyclone.

Tsunami literally means 'harbour wave' in Japanese (tsu = harbour, nami = wave). The term originated because these waves were noticed by fishermen in open ocean where they weren't dangerous, but caused damage when reaching harbours. Killer, Giant, and Silent are descriptive but not the literal meaning.