Environmental Puzzle

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Across
  1. 4. what is the cause of throwing garbage in the river?
  2. 6. the process of changing old items into new useful products
  3. 8. a sudden shaking of the Earth caused by movement in the crust
  4. 10. where should we throw the trash?
Down
  1. 1. what is one of the garbage that is difficult to describe?
  2. 2. a large area filled with trees that is home to many animals and plants
  3. 3. a problem caused by too much trash in the environment?
  4. 5. what gas to breathe that is released in plants is?
  5. 7. what happens when the weather is cloudy?
  6. 9. a system formed by living organisms and their physical environtment