Upsc geography

2022-10-12 17:33:06 ■ CORAL BLEACHING

#coralrelief

◇ Coral bleaching refers to loss of algae from the corals resulting into the white colour which is indicative of death of corals.

◇ Global warming has been reported as the major factor of coral bleaching.

◇ Clive Wilkinson identified four overlapping levels of coral bleaching.

• Catastrophic bleaching adversely affecting 95 per cent of shallow water corals.

• severe bleaching accounting for 50-70 per cent death of corals.

• moderate bleaching resulting into 20-50 per cent coral mortality but with quick recovery.

• insignificant bleaching or no bleaching. ओपन / कमेंट

2022-10-12 16:40:54 ओपन / कमेंट

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2022-10-12 12:47:18 ■ LABRADOR CURRENT

#Oceancurrents

◇ The Labrador current, an example of cold current, originates in the Baffin Bay and Davis Strait and after flowing through the coastal waters of Newfoundland and Grand Bank merges with the Gulf Stream around 50°W longitude.

◇ This current brings with it a large number of big icebergs as far south as Newfoundland and Grand Bank.

◇ These icebergs present effective hindrances in the oceanic navigation. Dense fogs are also produced due to the convergence of the Labrador cold current and the Gulf Stream near Newfoundland.

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2022-10-12 09:50:59 ■ ATOLL

#coralreefs

◇ A ring of narrow growing corals of horseshoe shape and crowned with palm trees is called atoll. It is generally found around an island or in elliptical form on a submarine platform.

◇ Atolls are divided into 3 types. E.g. (i) true atoll characterized by circular reef enclosing a shallow lagoon but without island, (ii) island atoll having an island in the central part of the lagoon enclosed by circular reef, and (iii) coral island or atoll island does not have island in the beginning but later on island is formed due to erosion and deposition by marine waves.

◇ Shallow lagoon reefs are minor reef features which are annular in shape and are found in epi-continental seas like Indonesian Sea, South China Sea etc. The lagoon is a small pool. Faros are chains of small atolls having shallow small lagoons. Coral banks are isolated shapeless reefs. Coral pinnacles are small ridges which rise within the lagoons.

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