KERALA PSC / PHYSICAL GEOGRAPHY / COMPOSITION OF THE EARTH’S CRUST / NOTES

 

KERALA PSC / PHYSICAL GEOGRAPHY / COMPOSITION OF THE EARTH’S CRUST / NOTES

KERALA PSC / PHYSICAL GEOGRAPHY / COMPOSITION OF THE EARTH’S CRUST / NOTES

 

·       Most abundant element in atmosphere is Nitrogen (78%) the Oxygen (21%). But the most abundant element in the universe is hydrogen.

·       The crust is made up of rocks. The rocks are made up of minerals in a consolidated form

·       The process of rock formation, consolidation of mineral particles is called lithification

·       A rock can be defined as an aggregate of minerals

·       The ratio between the total amount of light reflected from an object in space and the total amount of light falling on an object is called albedo.

·       A perfect reflector has an albedo of 1 and earth has an albedo of 0.34 (34%)

 

Composition of Crust

 

Earth is made up of more than hundred elements

v Oxygen                            -                   46.5%

v Silicon                             -                   27.72%

v Aluminium                      -                   8.13%

v Iron                                 _                  5.01%

v Calcium                           -                   3.63%

v Sodium                            -                   2.85%

v Pottasium                         -                   2.62%

v Magnisium                       -                   2.09%

 

KERALA PSC / PHYSICAL GEOGRAPHY / COMPOSITION OF THE EARTH’S CRUST / NOTES