Land, Land, Everywhere

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Across
  1. 5. the sliding down of a mass of earth or rock from a mountain or cliff.
  2. 7. the process involving movement of mantlerock that is controlled directly by gravity and that includes such gradual movements
  3. 8. the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underlying the soil or oceans.
  4. 9. the action or process of causing so much damage to something that it no longer exists or cannot be repaired.
Down
  1. 1. a thick mass or lump of anything.
  2. 2. able or likely to cause harm or injury.
  3. 3. a mass of falling or fallen rocks.
  4. 4. the remains of something broken down or destroyed.
  5. 6. ground or soil of a specified situation, nature, or quality.
  6. 7. a mass of mud and other earthy material that is falling or has fallen down a hillside or other slope.