Water pollution

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Across
  1. 4. pollution to all water sources above ground, such as rivers, lakes, seas, and oceans,
  2. 6. Improperly discarded waste, such as fragments of plastic, rubber, or other manmade materials
  3. 7. when all of the oxygen used up so the oxygen needing plants die
  4. 8. most common type of water pollution
Down
  1. 1. too many nutrients for the water-based ecosystem
  2. 2. type of pollution caused by agriculture
  3. 3. naturally occurring form of water contamination
  4. 5. when harmful substances contaminate a stream, river, lake, ocean, aquifer, or other body of water, degrading water quality and rendering it toxic to humans or the environment.