Environmental problems and natrual disasters

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Across
  1. 3. uncontrolled fires that spread quickly through forests
  2. 4. big amounts of rain causes...
  3. 6. What is it called when there are too many people
Down
  1. 1. What happens when harmful substances enter the environment
  2. 2. sudden shaking of the ground
  3. 5. weather events that involve strong winds, heavy rain, thunder, and sometimes lightning or hail.