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1) geology 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) the study of the rocks, processes, and history of Earth. 2) maps a) hand-held device with a magnetic needle used to find magnetic north. b) an instrument that measures the magnetic field intensity. c) a two-dimensional representation, usually of some part of Earth's surface. d) arly 20th century hypothesis, made by Alfred Wegener, that the continents move about on Earth's surface. 3) echo sounder a) hand-held device with a magnetic needle used to find magnetic north. b) a device that uses sound waves to measure the depth of the seafloor and can be used to map the seafloor. 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) continental drift a) a large area, usually below sea level, that collects sediments due to being bowl shaped. 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) mechanism a) height of a feature measured relative to sea level. 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) trenches 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) sea level 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) the average height of the ocean; the midpoint between high and low tide. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 8) sea level 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) the average height of the ocean; the midpoint between high and low tide. 9) magnetic polarity a) the direction of the Earth's magnetic field; a compass today will point north, which is normal polarity; south is reversed. 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) normal polarity a) when the north and south magnetic poles are the same as they are now. 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) continent 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) land mass above sea level. d) a magnetic mineral that takes on Earth's magnetic polarity as it crystallizes. 12) convection a) the crust that makes up the continents; thicker and less dense than oceanic crust. b) the movement of material due to differences in temperature. 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. 13) convection cell a) the middle layer of the Earth, made of hot rock that circulates by convection and located between the crust and the core. b) tentative explanation to a scientific question that can be tested. c) a circular pattern of hot material rising and cool material sinking. d) when the north and south magnetic poles are the same as they are now. 14) mantle a) a circular pattern of hot material rising and cool material b) tentative explanation to a scientific question that can be tested. c) the middle layer of the Earth, made of hot rock that circulates by convection and located between the crust and the core. d) land mass above sea level. 15) lava a) the mechanism for moving continents; the formation of new seafloor at spreading ridges pushes lithospheric plates on the Earth's surface. b) tentative explanation to a scientific question that can be tested. c) molten rock that has reached the Earth's surface. d) molten rock deep inside the Earth.

Seafloor Spreading Hypothesis

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