Nature? Maybe..

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Across
  1. 7. Vehicle for space exploration
  2. 8. NBA superstar known for his basketball prowess
  3. 10. tall plant with trunk and branches
  4. 11. Large body of saltwater
  5. 12. 'shake it off'
  6. 14. Green ogre from a swamp
Down
  1. 1. large landform that rises above its surroundings
  2. 2. Bloom in gardens or the wild
  3. 3. catch it and abuse it for fighting
  4. 4. deep gorge, typically with river flowing through it
  5. 5. dense collection of trees
  6. 6. elevated areas of land smaller than mountains
  7. 9. shoreline of sand or pebbles beside a body of water
  8. 13. open land used for agriculture, sport and other purposes
  9. 14. source of light and heat
  10. 15. natural flowing watercourse