Nature vocabulary

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Across
  1. 2. to move with a jolting rhythm
  2. 5. a natural flowing watercourse
  3. 6. a hollow place inside the earth
  4. 9. it is surrounded by water
  5. 10. a meal eaten outdoor
  6. 12. a growth of trees and other plants
Down
  1. 1. an elevated portion of the Earth's crust
  2. 3. a journey made on foot which is usually arduous
  3. 4. a place full of sand and pebbles on a shore
  4. 7. to go on an extended walk for pleasure
  5. 8. a semiaquatic egg-laying mammal
  6. 11. the wormlike larva of a butterfly or moth.