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Quiz 2: Paleomagnetism and 'Seafloor Spreading'

Quiz 2: Paleomagnetism and 'Seafloor Spreading'

Choose the best possible answer to the following questions about Key Concept 2 "Paleomagnetism and Hess’ hypothesis of 'seafloor spreading'."

This activity contains 6 questions.

	Seafloor spreading was supported as an idea after which discovery was made during WWII?   fossil evidence between S. America and Africa mid-ocean ridge system, middle of the Atlantic Ocean fossil evidence between India and Africa magnetic “stripes” on the ocean floor

	Which of the following is NOT information to be learned from the rocks of the world’s seafloor in support of “seafloor spreading” and (later) plate tectonics?   symmetry of the ages of rocks across mid-ocean ridges seismic data to locate mid-ocean ridges fossil evidence in the ocean crust across mid-ocean ridges symmetry of magnetic data across mid-ocean ridges

	Which of the following best describes Hess' hypothesis of seafloor spreading ?   Sinking material in the mantle spreads laterally, forcing seafloor into continents at the edges of ocean basins. Rising material in the mantle spreads laterally, carrying the seafloor away from seafloor ridges in the center of the ocean basin. Sinking material in the mantle causes seafloor to diverge at the edges of continents. Rising material in the seafloor and ocean basin causes the seafloor to spread laterally away from continents.

	All of the following are associated with Hess' hypothesis of seafloor spreading, except ______.   oceanic ridges are located above zones of mantle upwelling old seafloor crust descends back into the mantle at deep ocean trenches continents "plow" through the seafloor, away from ocean ridges new crust is formed at the ridge crest as old seafloor migrates away from it in both directions mantle upwelling

	What was the final, indisputable evidence (discovered in the 1960s) for seafloor spreading and consequently plate tectonics?   parallel magnetic “stripes” recorded in ocean floor mountain belts between different bits of crust tsunamis continental drift hypothesis / seafloor spreading idea

	What was one major scientific advantage of Hess' seafloor spreading hypothesis over Wegener's continental drift hypothesis?   Harry Hess was a better scientist. Seafloor spreading is more plausible than continents cutting through seafloor. The seafloor spreading hypothesis provided many more testable ideas. The seafloor spreading hypothesis made more sense to people opposed to continental drift.

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