KERALA PSC / PHYSICAL GEOGRAPHY / PLATE TECTONICS THEORY/ NOTES

 

KERALA PSC / PHYSICAL GEOGRAPHY / PLATE TECTONICS THEORY/ NOTES

KERALA PSC / PHYSICAL GEOGRAPHY / PLATE TECTONICS THEORY/ NOTES

·       Plate tectonics theory was put forward by A Holmes. According to this theory the lithosphere of earth is considered to be divided into lithospheric plates. Each plate is capable of moving over the asthenosphere carrying oceanic or continental crust alike. At plate boundaries major landforms are created

·       Most theories about the origin of the earth assumes that it began in a gaseous state

·       Life appeared on earth only when the earth cooled from its gaseous state to solid one.

·       Carbon dating is the most important method for estimating the age of fossils found in the rocks of the earth’s crust.

·       The age of the earth is estimated to be about 4.6 million years.

 

 KERALA PSC / PHYSICAL GEOGRAPHY / PLATE TECTONICS THEORY/ NOTES