Upsc geography

2022-10-10 15:33:46 ओपन / कमेंट

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2022-10-10 09:45:49 ■ CORAL REEFS AND ATOLLS

#corals

◇ Coral reefs and atolls are significant submarine features. These are formed due to accumulation and compaction of skeletons of lime secreting organisms known as coral polyps.

◇ Coral polyps thrive in the tropical oceans confined between 25°N-25°S latitudes and live on lime.

◇ Numerous coral polyps live, at a place, in groups in the form of colony and form calcareous shells around them.

◇ Since coral polyps cannot survive above water level and hence coral reefs are always found either upto sea level or below it.

◇ They are generally attached to submarine platforms or islands submerged under seawater.

◇ It may be mentioned that coral reefs are more diverse than the tropical rainforests because the coral reefs have about 1,000,000 species of which only 10 per cent have been studied. This is why these are called as rainforests of the oceans.

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2022-10-10 08:31:15 ओपन / कमेंट

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2022-10-09 18:53:30 ■ BARRIER REEF

#Coralreefs

◇ The largest coral reefs off the coastal platforms but parallel to them are called barrier reefs.

◇ Barrier reefs are the largest, most extensive, highest and widest reefs of all types of coral reefs.

◇ The average slope is about 45° but some barrier reefs are characterized by 15–25-degree slope.

◇ There is extensive but shallow lagoon between the coastal land and barrier reef. Barrier reefs are seldom found as continuous chains rather they are broken at many places and thus the lagoons have contact with the open seas and oceans through tidal inlets.

◇ Sometimes, tidal inlets are so wide that ships enter the lagoons through them.

◇ Sometimes, the base of barrier reefs exceeds the required depth for the development of coral polyps i.e. 300 feet (91m). Thus, the existence of barrier reefs at such greater depth (beyond the permissible depth of 6077m) poses the problem of their formation.

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2022-10-09 10:14:00 ■ FRINGING REEF

#Coralreefs

◇ Coral reefs developed along the continental margins or along the islands are called fringing reefs.

◇ The seaward slope is steep and vertical while the landward slope is gentle.

◇ The upper surface is uneven and corrugated.

◇ Though fringing reefs are usually attached to the coastal land but sometimes there is gap between them and land and thus lagoon is formed between the fringing reef and the land. Such lagoon is called boat channel.

◇ Coral reefs are generally long but narrow in width. The continuity of coral reefs is broken wherever rivers drain into the seas and oceans.

◇ Coral reefs are basically of two types e.g. (i) coral reefs facing open ocean and (ii) coral reefs protected by a barrier. Such fringing reefs are found along Sakau island, southern Florida, Mehetia island (of Society Group of Islands) etc.

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