Earthquakes

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Across
  1. 3. The formation of new areas of oceanic crust, which occurs through the upwelling of magma at mid ocean ridges and its subsequent outward movement on either side.
  2. 6. A sudden violent shaking in the ground that sometimes causes destruction as a result of movement within the earth's crust or volcanic action.
  3. 7. The seismicity, or seismic activity, of an area is the frequency, type, and size of earthquakes experienced over a period of time. The word tremor is also used for non-earthquake seismic rumbling.
Down
  1. 1. Plate tectonics is a scientific theory that explains how major landforms are created as a result of Earth's subterranean movements.
  2. 2. The gradual movement of the continents across the earth's surface through geological time.
  3. 4. The rigid outer part of the earth, consisting of the crust and upper mantle.
  4. 5. The upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.