78.) The ultimate driving mechanism for sea-floor spreading and lithospheric pla

Question

78.) The ultimate driving mechanism for sea-floor spreading and lithospheric plate motion is probably: a.) Hurricane-force winds which can push lithospheric plates around b.) Convection cells in the mantle c) Convection cells in the core d.) Polarity reversals of Earth's magnetic field e.) All of the above are possible driving mechanisms 79.) All of these were given by Wegener as evidence to support his theory of continental drift except: a.) The size and location of Earth's major river systems b.) The outline of the continents which fit together like the pieces of a puzzle c.) The pattern of ancient glaciation found on all of the southern continents d.) The existence of very similar fossil organisms on what are now widely separated continents e.) Similarity of rocks found along the margins of what are now widely separated continents 80.) Both Mt. St. Helens and Mt. Rainier are volcanoes that lie above thes subduction zone. a.) Basin and Range b.) Vancouver c.) California d.) Cascadia e.) San Andreas

Explanation / Answer

78. b. convection cells in the mantle.

the mantle convection, ridge push , and subduction pull forces are together responsible for plate motion.

79. a. The size and location of major earth systems

rivers have no role in continental drift mechanism.

80. d cascadia

at the subduction boundary of Juan De fuca and North American plate

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