US Environmental Protection Agency presents this Advanced Notice of Proposed Rulemaking (ANPRM) on the Clean Water Act definition of "Waters of the United States," which has important ramifications for wetland...
This exercise, from the Environmental Science Activities for the 21st Century Project, is designed to introduce students to the idea that human activities can alter the chemistry or gaseous composition of the atmosphere...
Environmental Protection Agency provides classroom exercises and experiments for 7th through 12th grade students encouraging environmental awareness.
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