Nature

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Across
  1. 3. becomes TSRDEE (Clue: A dry, barren area of land)
  2. 6. becomes COOLVAN (Clue: A mountain with a crater that spews lava (Anagram))
  3. 7. becomes LEGNUJ (Clue: A thick, overgrown tropical forest)
  4. 8. becomes SOFRET (Clue: A dense growth of trees (Anagram))
  5. 9. becomes MOST R (Clue: A violent disturbance of the atmosphere)
  6. 10. becomes ANEOC (Clue: The vast body of salt water covering most of the Earth)
Down
  1. 1. becomes ZEERBE (Clue: A gentle, refreshing wind (Anagram))
  2. 2. becomes TANPEL (Clue: A large celestial body in orbit around a star)
  3. 4. becomes IVRER (Clue: A large natural stream of water flowing to the sea)
  4. 5. becomes TRINEW (Clue: The coldest season of the year)
  5. 8. becomes RWOLEF (Clue: A colorful plant bloom (Anagram))