8. That the oceanic cnust is geologically young and the parallel magnetic stripi

Question

8. That the oceanic cnust is geologically young and the parallel magnetic striping patterm of basalts is symmetrical about oceanic rnidges was conclusively shown by A. radiometric dating of oceanic basalts and sequences from continents B. the unusually thin layer of oceanic sediments and the ages of contained fossils. C. the existence of the same patterns in all occan basins. D. A and B E. all of the above 9. In plate tectonic thcory, the lithosphere A. is composed of oceanic and continental crust and upper mantle B. rests upon the buoy ant asthenosphere. C. is destroyed as fast as it is created D, moves over, and with, the asthenosphere E. none of the above At divergent plate boundaries, the forces operating are A. compressional. B. tensional C. lateral shcaring (transform) D. thrusting E. nornal. 10. The forces opcrating at continent-continent convergent plate boundaries are A. tensional. B. extensional C. lateral shearing (transform). D. compressional. E. compressional and tensional. A transform plate boundary may connect A. a spreading ridge and subduction zone. B. two spreading ridges C. two subduction zones D. A and C E all of the above 12. The age and distnbution of the Hawaiian Islands-Emperor Seamount chain show that the absolute motion of the Pacific Plate from the past to the present was A. first noth-porthwesterly, then west-northwesterly B. first south-southcasterly, then east-southeasterly C. first north-northeasterly, then west-northeasterly D. first south-southwesterly, then west-southwestcry E. first north-northwesterly, then south-southeasterly. 13· 14. An acceptable hypothesis concerming the driving mochanism of plate tectonics must explain past plate configurations and movement B. present plate configurations and movement C. future plate configurations and movement D. B and C E. all of the above 15. The currently accepted hypothesis for the driving mechanism of plate tectonics is based on A. density differences between oceanic and continental crust B. the distribution of earthquakes and volcanoes C. thermal convection cells in the asthenosphere and mantle D. gravimetric and magnctic anamalics

Explanation / Answer

8) answer- option D- A and B

9) answer- option C- is destroyed as fast it is created.

plate techtonics describes the large scale motion of seven large plates and the movement of several small plates of the earth's lithosphere.The lithosphere, which is the outermost shell consists of seven large plates and several small plates and the annual motion varies from 0 to100 mm annually, thus we can say that the lithosphere is destroyed as fast as it is created because of the constant motion of plates.

10) answer- option b

tensional

At divergent plate boundary two plates are moving away from each other and that is because of the tension between the diverging point.

11) answer - option E

compressional and Tensional  

The force acting at continent continent convergent boundary is both compressional and tensional.

Convergent plate boundary are caused by regional compressional tectonic froces. They are associated by subduction zones where high density plate sinks under light plate.

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