Froggy Jumps Sea floor spreadingVersion en ligne All about Harry Hess idea par Jaime Tres 1 geology a the study of matter b the study of living things c the study of the rocks, processes, and history of Earth. 2 early 20th century hypothesis, made by Alfred Wegener, that the continents move about on Earth's surface. a sea floor spreading b continental drift c earthquakes 3 a deep gash in the seafloor; the deepest places on Earth. a trenches b mountains c volcanoes 4 the direction of the Earth's magnetic field; a compass today will point north, which is normal polarity; south is reversed. a compass b magnetic polarity c magnetometer 5 when the north and south magnetic poles are the same as they are now. a normal polarity b reverse polarity c direction 6 land mass above sea level. a ocean b continent c river 7 the movement of material due to differences in temperature. a conduction b convection c induction 8 the mechanism for moving continents; the formation of new seafloor at spreading ridges pushes lithospheric plates on the Earth's surface. a magnetism b continental drift c seafloor spreading 9 a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. a Gold b Magnetite c Lead 10 the crust that underlies the oceans; thinner and denser than continental crust. a continental crust b oceanic crust c island crust
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