Plate Tectonics

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Across
  1. 2. the soft layer of the mantle on which the lithosphere floats
  2. 5. /the transfer of heat by movements of a heated fluid.
  3. 7. a trace of an ancient organism that has been preserved in rock
  4. 8. the amount of mass in a given space; mass per unit volume
Down
  1. 1. a break in Earth’s crust where slabs of rock slip past each other
  2. 3. a device that determines the distance of an object under water by recording echoes of sound waves
  3. 4. the material that forms Earth’s hard surface.
  4. 6. a section of the lithosphere that slowly moves over the asthenosphere carrying pieces of continental and oceanic crust