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Chemistry 5 Online
OpenStudy (anonymous):

In a passive system, solar energy is collected by a. the moon. b. windows facing the sun. c. a photovoltaic cell. d. a solar collector.

OpenStudy (anonymous):

About how long will fossil fuels likely last if current trends continue? a. 20 years b. 200 years c. 2,000 years d. indefinitely

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