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.