Theme: Nature

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Across
  1. 4. A very large expanse of sea
  2. 7. A large natural elevation of the earth's surface
  3. 8. A piece of land surrounded by water
  4. 9. A large natural stream of water flowing in a channel to the sea
  5. 10. A large area covered chiefly with trees and undergrowth
Down
  1. 1. A mountain or hill with a crater through which lava erupts
  2. 2. A barren area of land where little precipitation occurs
  3. 3. A slowly moving mass or river of ice
  4. 5. A deep gorge typically with a river flowing through it
  5. 6. A cascade of water falling from a height