PLATE TECTONICS

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PLATE TECTONICS by Mind Map: PLATE TECTONICS

1. land is neither created nor destroyed

2. Alfred Wegener, german geophysicist made first complete statement of continental drift hypothesis, in 1912.

3. study of the movement of the earth's plates and their land forms

4. plates- divisions of the lithosphere floating on the asthenosphere

5. 7 major plates: nazca, pacific, north america, south america, eurasian, australian, african

6. Pangea

6.1. gondwana: african, south america, antarctica, indo australian, sub india.

6.2. laurasia: north america, asia, europe

7. plates float as a result of convection currents created by the heat within the earth

8. plates may move : alongside, towards, and away from each other

9. constructive/ spreading/divergent:

9.1. move away from each other causing new oceanic crust to rise/appear

9.2. form volcanic mid oceanic ridges

9.3. eg. north america and south america from eurasia and africa create the MID ATLANTIC RIDGE

9.4. eg. nazca and pacific form EAST PACIFIC RIDGE/ RISE

10. destructive/ subduction zone/covergent

10.1. oceanic crust moving towards continental crust, the oceanic crust sinks and is destroyed because it is heavier

10.2. form deep sea trenches, mountains, volcanic island arcs

10.3. eg. nazca and south america form ANDES (mountain)

10.3.1. move away from each other

10.4. juan de fuca and north america form ROCKIES (mountain)

10.5. cocos and caribbean form VOLCANIC ISLAND ARC OF W.I( volcanic island arc)

11. collision zone

11.1. 2 continental crust collide

11.2. form fold mountains

11.3. eg. indian and eurasian form HIMALAYAS

11.4. eg. african and eurasian form ALPS

12. transform/conservative/passive/parallel

12.1. eg. SAN ANDREAS FAULT