chapter 7 vocab

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Across
  1. 2. Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other. Seafloor spreading and other tectonic activity processes are the result of mantle convection. ... The less-dense material rises, often forming a mountain or elevated area of the seafloor.
  2. 6. a long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading. An example is the Mid-Atlantic Ridge.
  3. 7. Plate tectonics is a scientific theory that explains how major landforms are created as a result of Earth's subterranean movements.
  4. 8. polarity is defined as the magnetic minerals in the rock having the same polarity as the Earth's present magnetic field
Down
  1. 1. the gradual movement of the continents across the earth's surface through geological time.
  2. 3. when the continents were together
  3. 4. By magnetic reversal, or 'flip', we mean the process by which the North pole is transformed into a South pole and the South pole becomes a North pole
  4. 5. Polarity is when a receptacle is wired backward