Skip to main content

Types of Coral Reef

According to origin, coral reef are classified mainly three types-
                                                                                                                           I.         Fringing Reef.
                                                                                                                         II.         Barrier Reef.
                                                                                                                       III.         Atoll Reef.
I.Fringing Reef:
Fringing reef is a coral platforms attached to a continental coast or an island.
Characteristics:
  1. Fringing reef runs as a narrow belt, 0.5 km to 2.5 km wide.
  2. Sometimes separated by a narrow, shallow lagoon or channel.
  3. The surface of a fringing reef is rough.
  4. They developed through upward growth.
Example:
Gulf of Mannar (India), Southern Florida(USA).

II.Barrier Reef:
Barrier reef is a coral platforms separated from the the adjacent land mass by a wide deep channel.
Characteristics:
  1. Barrier reefs are the largest & the most extensive of all the reefs.
  2. It extends as a broken.
  3. The average slope of barrier reef is 45°.
  4. Lagoon or Lake is formed in the middle zone of mainland & barrier reef.
Example:
Great Barrier Reef(Australia).
III.Atoll:
Atoll is a ringing reef, which partly or completely encloses a lagoon.
Characteristics:
  1. Atolls are located at great distances from deep sea platforms, where the submarine features may help in formation of atolls, such as- a submerged island or a volcanic.
  2. An atoll surrounds a body of water called a lagoon.
  3. A ring shaped coral reef.
  4. The shallow lake of the middle of atoll is 80-140 m in depth.
Example:
Fiji Atoll, Funafuti Atoll.
Fig: Fringing reef, Barrier reef and Atoll

Labels:

Comments

Post a Comment

Popular posts from this blog

Concentric zone theory

Theories of City Structure-Concentric Zone Theory Introduction: The Concentric or Zonal Theory of urban landuse was first proposed in 1923 by E.W. Burgess. He was a sociologist. The idea behind the concentric model is that the development of a city takes place outwards from its central area in a series of concentric circles to form zones.  Assumption:        i.           Cultural & social heterogeneity of the population.       ii.           Commercial-industrial base to the economy of the city.     iii.           Private ownership of property & economic competition for space.     iv.           Expanding area & population of the city.       v.    ...
Post a Comment
Read more

Sources of Water Mass

Sub-surface water masses formation is more active in the North & South Atlantic & the South Pacific & moderately active in the North Pacific. The sub-surface water masses is not active in the Indian Ocean because of its location in the southern hemisphere. The following arte major source areas of the origin of subsurface water masses-                                            i.           Norwegian Sea Area,                                           ii.           Irminger ...
Post a Comment
Read more

Distinguish between Spatial data and Non-Spatial data

Subject Spatial data Non-Spatial data i. Definition Spatial data is a geographical data, the element of this spatial data are related to specific geographical coordinate & specific geographical attributes. Non-spatial data are unrelated to specific geographical location, this type of data generally related to a particular subject with which geographical location has no relation. ii.Geographical location Related to graphical location. Unrelated to geographical location. iii.Describe Describes the absolute and relative location of a geographical feature. Describes the characteristics of a geographical feature. iv.Forms of description This kind of data represents by diagrams, point, line, square, pixel. This kind of data represents by number. v.Example Location of river, Ground water extraction point. Depth, Height, Scale figure, Agricultural production. vi.Indicates Geographical location. Particular location. vii.Dependency It n...
Post a Comment
Read more