Aakash GargAIR 5 · CSE 2024 · 147 wordsTheir whole copy
Opening · a definition
Continental Drift theory by Alfred Wegner aimed to explain the formation of continents. It claimed that polar fleeing force and tidal force shaped earth's lithosphere.
Later, plate tectonics overcame the limitations of continental drift theory.
Body · points and prose
Role of plate tectonics: → Plates are lithospheric fragments sliding over semi molten asthenosphere energised by convective currents. 3 types of interaction:
a) Convergent (Destructive) plate boundary: It leads to formation of fold mountains along
with volcanoes. E.g: Pacific Belt of Fire.
b) Divergent (Constructive) Plate Boundary: Leads to formation of new oceanic crust. e.g: Mid-Atlantic Ridge leading to widening of Atlantic ocean.
c) Transform boundary: Causes earthquakes without crust formation or destruction.
Close
Plate tectonics have the previous supercontinent of Pangea broke into Gondwanaland and other parts forming different continents. Later split of Angaraland led to formation of Asia and N. America. Further, movement of Indo-Australian plate led to formation of Himalayas.
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