13) Plate tectonic theory postulates all of the following EXCEPT that A) lithosp

Question

13) Plate tectonic theory postulates all of the following EXCEPT that A) lithospheric blocks move. B) Earth is expanding. C) continental crust is broken into large fragments. D) old lithosphere is destroyed in subduction zones. E) new crust is created in rift zones. 14) If the continental crust in one tectonic plate collides with the continental crust in another, a common result is A) formation of a folded mountain belt. B) subduction of one of the continents. C) block faulting of the Basin and Range type. D) formation of andesitic volcanoes. E) formation of basaltic volcanism. I5) Which of the following features would you normally find along a convergent type of plate boundary? A) mantle-plumes or hot-spots B) subduction zones C) mid-oceanic ridge D) transform faults E) seamounts 16) Which of the following indicates direction of plate motion? A) the trend of the oceanic ridge system B) trends of seamounts C) the trend of fracture zones D) the trend of magnetic reversal patterns E) all of the above 17) In addition to plates moving A) plate margins can move as well. B) spreading centers themselves may move and migrate. C) both spreading centers and subduction zones may migrate and ultimately be destroyed. D) the lengths of plate margins may grow larger with time. E) all of the above 18) The basic energy for sea-floor spreading and continental drift is theorized to be A) upthrusting of lithospheric plates B) isostatic adjustment of parts of the Earth's crust. C) reversals of the magnetic poles. D) thermal convection of the mantle and lithosphere. E) derived from tidal forces. isostatic adjustment of parts of the Earth's crust

Explanation / Answer

13) earth is expanding

earth do not expand, surfface area of earth is constant.

14) formation of folded mountain belt

when two plates of equal density collide each other they will tend to form mountains.

15)mantle plumes or hot spots

when the subducting plate start to melt they tend to rise below the over riding plate.

16) all of the above

all these factors can indicate direction of plate motion

17) all of the above

all these process will take place along the plate margins

18)thermal convection of mantle and core

the convectional currents in the mantle drag the plates, and new crust is form at the separation of this plates.

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