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2011-06-30 18:21:45

Ground-level ozone is an air pollutant that harms humans and plants.

2009-03-12 22:25:18

A U.S.


Word of the Day
ecotone
  • A transitional zone between two communities containing the characteristic species of each.
The word 'ecotone' comes 'eco-' plus a Greek root meaning 'tension'.