Natural world

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Across
  1. 2. A large natural stream of water flowing in a channel to the sea, a lake, or another river.
  2. 6. A mountain or hill having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.
  3. 8. The variety of life in the world or in a particular habitat or ecosystem.
  4. 10. The natural home or environment of an animal, plant, or other organism.
  5. 11. A dense, tropical forest with a high amount of annual rainfall.
  6. 12. A large natural elevation of the earth's surface rising abruptly from the surrounding level.
Down
  1. 1. Animals that are not domesticated and live in natural habitats.
  2. 3. A biological community of interacting organisms and their physical environment.
  3. 4. The weather conditions prevailing in an area in general or over a long period.
  4. 5. A barren area of landscape where little precipitation occurs and consequently living conditions are hostile for plant and animal life.
  5. 7. A very large expanse of sea.
  6. 9. A large area covered chiefly with trees and undergrowth.