Human influence on ecosystem

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Across
  1. 5. gas that produced by anaerobic fermentation of livestock waste.
  2. 6. the removal of marine species from the ocean at a rate faster than they can reproduce and replace themselves.
  3. 7. the intentional clearing of forests or trees on a massive scale, resulting in a permanent loss of forest cover.
  4. 8. a substance or energy introduced into the environment that has undesired effect.
  5. 9. number of different species that live in particular area.
  6. 10. the ability of an organism, cell, or microorganism to withstand the harmful effects of a pathogen, parasite, toxin, drug, or environmental stress.
Down
  1. 1. only one type of crop is grown on an area of farmland.
  2. 2. the process or industry of extracting valuable minerals, metals, coal, or other geological materials from the Earth's crust, typically from underground shafts or surface pits.
  3. 3. natural or synthetic substances added to soil or plant foliage to supply essential nutrients.
  4. 4. a process in which nutrients accumulate in a body of water, resulting in an increased growth of organism.