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1) mid-ocean ridge a) hand-held device with a magnetic needle used to find magnetic north. b) an instrument that measures the magnetic field intensity. c) process by which something takes place. d) a large, continuous mountain range found within an ocean basin; it is the location on the seafloor where magma upwells and forms new seafloor. 2) axis a) hand-held device with a magnetic needle used to find magnetic north. b) an instrument that measures the magnetic field intensity. c) an imaginary line that runs from the North Pole to South Pole through the center of Earth. d) arly 20th century hypothesis, made by Alfred Wegener, that the continents move about on Earth's surface. 3) continental drift a) hand-held device with a magnetic needle used to find magnetic north. b) early 20th century hypothesis, made by Alfred Wegener, that the continents move about on Earth's surface. c) process by which something takes place. d) arly 20th century hypothesis, made by Alfred Wegener, that the continents move about on Earth's surface. 4) normal polarity a) when the north and south magnetic poles are the same as they are now. b) arly 20th century hypothesis, made by Alfred Wegener, that the continents move about on Earth's surface. c) process by which something takes place. d) an instrument that measures the magnetic field intensity. 5) reversed polarity a) when the north and south magnetic poles are the same as they are now, reversed. b) rock that originates in a volcano or volcanic feature, formed from lava or magma. c) process by which something takes place. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 6) trench a) a field produced by a magnetic object that exerts a force on other magnetic materials or moving electrical charges. b) a deep gash in the seafloor; the deepest places on Earth. c) process by which something takes place. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 7) map a) a field produced by a magnetic object that exerts a force on other magnetic materials or moving electrical charges. b) a solid mixture of minerals or mineral grains; a few types of rocks are made from materials that are not minerals. c) a two-dimensional representation, usually of some part of Earth's surface. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 8) rocks a) a field produced by a magnetic object that exerts a force on other magnetic materials or moving electrical charges. b) a solid mixture of minerals or mineral grains; a few types of rocks are made from materials that are not minerals. c) molten rock that has reached the Earth's surface. d) a mineral that is really big. 9) crest a) the highest point of a wave. b) a solid mixture of minerals or mineral grains; a few types of rocks are made from materials that are not minerals. c) molten rock that has reached the Earth's surface. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 10) continental crust a) the crust that makes up the continents; thicker and less dense than oceanic crust. b) a solid mixture of minerals or mineral grains; a few types of rocks are made from materials that are not minerals. c) molten rock that has reached the Earth's surface. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 11) sediment a) the crust that makes up the continents; thicker and less dense than oceanic crust. b) a solid mixture of minerals or mineral grains; a few types of rocks are made from materials that are not minerals. c) particles of rock or minerals ranging in size from clay to giant boulders. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 12) seafloor spreading a) the crust that makes up the continents; thicker and less dense than oceanic crust. b) the mechanism for moving continents; the formation of new seafloor at spreading ridges pushes lithospheric plates on the Earth's surface. c) areas covered by ocean water; the three major ocean basins are the Pacific, Atlantic, and Indian. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes.

Magnetic Evidence for Seafloor Spreading

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