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Pollution is the introduction of contaminants into a natural environment that causes instability, disorder, harm or discomfort to the ecosystem i.e. physical systems or living organisms. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the elements of pollution, can be either foreign substances/energies or naturally occurring contaminants. Pollution is often classed as point source or nonpoint source pollution. The Blacksmith Institute issues an annual list of the world's worst polluted places. In the 2007 issues the ten top nominees are located in Azerbaijan, China, India, Peru, Russia, Ukraine and Zambia.
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As high schoolers prepare for final exams, teens nationwide may be tempted to use a "study drug"—a prescription stimulant or amphetamine—to gain an academic edge. But a new University of Michigan poll shows only one in ...
Health May 20, 2013 | not rated yet | 0