Littering

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Across
  1. 3. to make sth go through the air, using your hand and arm
  2. 6. unpleasant to look at; not attractive
  3. 8. garbage people have dropped on the ground
  4. 11. the reason why something bad happens
Down
  1. 1. to put something into a hole in the ground and cover it
  2. 2. to make an area or substance, usually air, water, or soil, dirty or harmful to people, animals, and plants, especially by adding harmful chemicals
  3. 4. to be hurt, damaged, or destroyed by fire
  4. 5. to have an influence on someone or something, or to cause a change in someone or something
  5. 7. to try to find something or someone
  6. 9. a device or hole for catching animals
  7. 10. to drop something in a careless way