Development of a Theory

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Across
  1. 5. The closer the crust is to a mid-ocean ridge, the_______the oceanic crust is.
  2. 8. The type of rock formed when lava cools on the ocean floor.
  3. 10. a device used to measure and record the magnetic signature of rocks.
  4. 11. The process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge.
  5. 12. A state in which magnetized objects such as compass needles, will orient themselves to point north.
Down
  1. 1. The part of the seafloor the section of seafloor that is thick enough to make the seafloor smooth.
  2. 2. When the magnetic field reverses direction.
  3. 3. When magnetized objects reverse direction and orient themselves to point south.
  4. 4. The iron-rich liquid outer core is like a giant magnet that create Earth's____________.
  5. 6. The device used in the 1940's to explore the seafloor.
  6. 7. The mountain ranges in the middle of the oceans.
  7. 9. These do not move through the solid mantle or seafloor.
  8. 13. When seafloor spreads, this melts and forms magma.