Ecology crossword puzzle

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Across
  1. 2. a long period when there is little or no rain
  2. 3. when the planet gets warmer
  3. 5. rain
  4. 7. gas, coal, or oil
Down
  1. 1. when there is little to no water available
  2. 4. what you put in your car to make it run
  3. 6. what is extracted from the ground mainly in the middle east