lunes, 27 de septiembre de 2010

Vocabulary 15

renewable resource: a resource that can be replaced in a short period of time.


ozone layer: a layer of ozone gas in the atmosphere that screens out much of the Sun´s UV rays.


fossil fuel: a fuel formed from the decay of ancient forms of life.


smog: a mixture of smoke and fog.

acid rain: moisture  that falls to Earth after being mixtured with wastes from burned fossil fuels.

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