Natural disasters

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Across
  1. 5. the movement downslope of a mass of rock, debris, earth, or soil
  2. 6. to cause something new, or many new things, to grow or start suddenly
  3. 7. a curved shape sticking out from the surface of something
Down
  1. 1. a sign that something is going to happen
  2. 2. unwilling or unable to stay still or to be quiet and calm, because you are worried or bored
  3. 3. to be likely to cause harm or damage to something or someone
  4. 4. maintained at length without interruption or weakening : lasting, prolonged