Geography Concepts

El Nino :-

El- Nino is Spanish word for male child ( Christ Child)

El Nino refers to two things:-
1. ceasing of upwelling off west coast of South America (Eastern Pacific Ocean)

2. appearance of warmer waters than average on the surface of ocean off the west coast of South America.

Statistically, El-nino has been found have a negative correlation with India’s summer monsoon rains.

La- Nina:-
Spanish word for Girl Child and refers to the reinforce or augmented or strengthened normal situation in the Eastern Pacific Ocean
Statistically, La- Nina has been found to have positive correlation with India’s summer monsoon rains.

Walker Cell:-
Term walker cell in general refers to prominent east west pressure cell of atmospheric circulation ( especially in tropical areas)

Southern Oscillation:-
It’s given by Sir Gilbert Walker
It refers to sea saw arrangement of atmospheric pressure conditions between Pacific and Indian Ocean.

Southern Oscillation Index :-
(Tahiti’s Atmospheric pressure ) – (Darwin’s atmospheric pressure)

Landform term refers to the earth’s surface configuration e.g Hill, Valley, Plateau, Plain etc…
A given landscape in nature represents stage of external fight between endogenic and exogenic process.

Sun is primary source of energy for exogenic processes.
It’s generally believed that radiative disintegration of element is primary source of energy for endogenic processes.

Endogenic and exogenic processes are collectively referred as geomorphic processes.

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