Moon of the Crusted Snow

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Across
  1. 2. A period of intense difficulty or danger. (6 letters)
  2. 4. The ability to recover from difficulties. (10 letters)
  3. 6. A condition of being cut off from others or without communication. (9 letters)
Down
  1. 1. A way of staying alive, especially during difficult or dangerous situations. (8 letters)
  2. 3. A necessary element or means to accomplish a task. (6 letters)
  3. 5. Lacking in inhabitants or activity; barren. (8 letters)