Nature

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Across
  1. 3. opposite to "deep"
  2. 5. made of rock and therefore usually rough and difficult to travel along
  3. 7. a large hole in the side of a hill, cliff, or mountain, or one that is underground
  4. 10. water, especially from a river or stream, dropping from a higher to a lower point, sometimes from a great height
Down
  1. 1. having a small distance from one side to the other, especially in comparison with the length
  2. 2. an area of low land between hills or mountains
  3. 4. the land along the edge of a sea, lake, or wide river
  4. 6. water that flows naturally along a fixed route formed by a channel cut into rock or ground, usually at ground level
  5. 7. a high area of rock with a very steep side, often on a coast
  6. 8. rising or falling at a sharp angle
  7. 9. an area of land that is higher than the surrounding land