Geography,

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Geography

1-Continental Shelf -The border zone between land and sea with depth upto 200 mts is called continental shelf.

2-Continental slope-The complex relief of the ocean spread from 200mts to 3000 mts is called Continental slope.

3-Salinity-The total content of dissolved salts in sea water is called salinity.

4-Isohaline- A line joining the points in the ocean having the same degree of salinity is called Isohaline.

5-Stream – The ocean current that flows speedily is called a stream.

6-As one goes deep inside the oceans, the temperature rapidly dereases by every 1 km and remains stable at the foot of the ocean.

7-Drift -The ocean current that flows slowly is called a drift.

8-Transpiration- A considerable proportion of water vapour released into the atmosphere by plants through a process is called transpiration.

9-Deep sea plain-Gently sloping areas of the ocean basin whose depths vary between 3000 mts to 6000 mts are called deep sea plains.

10-Centrifugal force -The radially outward force on a body in a uniform circular motion observable only in a rotating frame of reference is called centrifugal force.

11-Of the total water on earth,97.25 % is saline ocean waters and 2.75 % is fresh water.

12-From all sources of water reaching the earth,less than 1 % of water is useful to man.

13-The cyclic process in which water undergoing a cycle from oceans to land and land to oceans is called Hydrological cycle.

14-There are six stages of water cycle, they are Evaporation, Transportation, Condensation, Precipitation, Runoff and Ground water.

15-Continents and oceans are the first order relief features of the earth.

16-There are five oceans on the earth.They are The Pacific ocean, the Atlantic ocean, the Indian ocean, the southern ocean and the arctic ocean.

17-Millions of years ago, oceans were combined together.The single super ocean was known as Panthalsa.

18-A salinity is usually expressed as parts per thousand or PPT.

19-Generally war currents flow towards the poles and cold currents flow towards the equator.

20-Centrifugal forces, effects of winds, effect of precipitation and effect of solar energy are the causes for the ocean currents.

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