the part of a continent that is stable and forms the central mass of the continent

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Across
  1. 2. a hypothetical continent including all the landmass of the earth
  2. 4. a land mass that projects well above its surroundings; higher than a hill
  3. 6. the solid part of the earth consisting of the crust and outer mantle
  4. 7. the part of a continent that is stable
  5. 8. geological process in which one edge of a crustal plate is forced sideways
Down
  1. 1. drift gradual movement and formation of continents (as described by plate tectonics)
  2. 3. a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt
  3. 5. the outer layer of the Earth