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Tides and Coral Bleaching - Oceanography
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Bhanwar through this lesson has explained various kinds of tides, coral reefs and also phenomenon of coral bleeching and he has in the end gave a brief explanation of oceanic deposits found in the oceanic water.

Bhanwar Singh
Ex- National Defence Academy (115 Course) Cleared Civil Services Examination, 2012

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Unacademy user
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sir make video in hindi please
thanks sir * 10000000 time for clear my concept .
best video sir on corals and tides thanks
thanks sir ,well explained...
  1. CRASH COURSE-WORLD GEOGRAPHY Presented by - Bhanwar Singh Sirohi


  2. OCEANOGRAPHY - TIDES AND CORAL BLEACHING


  3. TIDES The periodical rise and fall of the sea level, due to attraction pull of the Sun and the Moon is called a Tide Every place experiences tides twice a day and there is delay of 12 hours 26 minutes between both of them There are two types of tides experienced on the basis of the position of the Sun, the Moon and the Earth Spring Tides ed


  4. SPRING AND NEAP TIDES Sun New moon Spring tide Neap tide First quarter moon Earth Third quarter moon Neap tide Spring tide Full moon


  5. OTHER TYPE OF TIDES EQUINOCTIAL SPRING TIDE These occur at an interval of six months DAILY AND SEMI-DIURNAL TIDE The tides which occur after the interval of 24 hours 52 minutes are Daily Tides The tides which occur after the interval of 12 hours 26 minutes are Semi-Diurnal Tides APOGEAN AND PERIGEAN TIDE a The time when the moon is farthest from the earth i.e. in Apogee, it creates low n The time when the moon is farthest from the earth i.e. in Apogee, it creates low tides which are called Apogean Tides When moon isclosest to the earth i.e. in Perigee, the high tides are caused which are known as Perigean Tides


  6. CORAL REEFS Coral polyps are the living organisms of the oceanic water which are responsible for building Coral Reefs Coral Reefs are formed due to cementation and compaction of skeletons of numberless dead coral polyps Grow in clean sediment free water Coral polyps thrive in tropical oce ans confined between 25 N-25 S latitudes Found at the depth of 200ft to 300 ft where the sunlight reaches Ideal temperature for their growth is 20 C to 25 C and average salinity should be 25%o to 30% Global warming is a severe threat to their existence


  7. TYPES OF CORAL REEFS FRINGING REEFS-Found near an island or a continent. Its structure remains submerged below the oceanic water. lt also leads to formation of lagoon or boat channel sometimes For e.g. Florida, Malaysia, Andaman & Nicobar Islands BARRIER REEFS-Their slope is more towards the sea. For e.g. The Great Barrier Reef in the east of Australia ATOLL REEFS-Its structure is horse-shoe or ring like. Island may be present in between these reef structures. For e.g. Fiji Atoll, Funafuti Atoll, Cook Atoll, etc


  8. CONTINENT ewre OCEA* Lt ATOLL


  9. CORAL BLEACHING There is symbiotic association between coral polyps and algae known as zooxanthellae Coral Bleaching refers to loss of algae from the corals which results a Global warming is the major fator of coral bleachino into white colour Global warming is the major factor of coral bleaching Coral Reefs are important because Foundation of may marine species Environmental indicators of water quality Protect shores from storms and flood


  10. OCEAN DEPOSITS OCEAN DEPOSITS TERRIGENOUS PALAEGIC ORGANIC INORGANIC RED MUD GREEN BLUE MUD MUD CALCAREOUS SILICEOUS RED VOLCANIC MATERIALS CLAY GLOBIJERINA PTEROPOD DIATOM RADIOLARIAN