NATURE

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Across
  1. 4. An animal with a characteristic pattern of black or dark brown stripes on a whitish background
  2. 5. Conserving by reusing (directly or after reprocessing) such used materials as aluminum, glass and paper
  3. 7. Either of the two occasions, six months apart, when day and night are of equal length
  4. 8. A fall of large masses of snow and ice down a mountain
  5. 9. Extremely cold
  6. 10. Land almost completely surrounded by water except for an isthmus connecting it with the mainland
Down
  1. 1. The introduction of harmful substances or products into the environment
  2. 2. Very light rain
  3. 3. An animal that eats flesh
  4. 6. Complete destruction; annihilation
  5. 10. A still body of water smaller than a lake