Arctic Puzzle

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Across
  1. 3. this type of frozen soil stores significant amounts of greenhouse gasses.
  2. 5. the Arctic ______ line of latitude at approximately 66 degrees 33'N of the equator.
  3. 6. a part of the deer family prevalent in the Arctic
Down
  1. 1. the region at the northmost of the globe
  2. 2. climate change in the arctic happens ____ than in other places)
  3. 3. the apex predator of the ecosystem classified as vulnerable
  4. 4. an environmental challenge faced is that ice is ____