Environmental Challenges

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Across
  1. 5. stubborn or persistent
  2. 6. happens again and again at regular time intervals
  3. 7. lengthened in time
  4. 8. something that causes discomfort or trouble
Down
  1. 1. an extremely serious or tragic event that includes loss and lasting distress
  2. 2. produced or created
  3. 3. proper arrangement of parts in relation to one another
  4. 4. light from the sun or moon is fully or partially hidden by another celestial body