Competitive Exams: Plate tectonics basics

  • Plates: Broad rigid segments of lithosphere that floats on the underlying Asthenosphere.

  • Thickness: 100 − 150 km Tectonic activity-Breaking and bending of lithosphere and boundary interactions between plates.

  • Plate tectonics: Scientific achievement of the decades of 1960s.

  • Based upon 2 concepts-Continental drift and Sea floor spreading.

  • Term ‘PLATE’ -1st used by Canadian Geophysicist J. T. Wilson (1965).

  • W J Morgan and Le Pichon elaborated the concept of plate tectonics in 1968.

  • The concept is based upon the theories of continental drift, paleomagnetism and sea-floor spreading.