Generation of electricity using photovoltaic cells
A. would involve commitment of considerable land and material for large-scale use.
B. is most practical for large industrial consumers.
C. is not technologically possible at present.
D. causes some pollution because toxic chemicals are released as the electricity is produced.
Answer: A
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Photochemical smog generally requires the presence of
a. nitrogen oxides b. Sunlight c. volatile organic compounds d. Heat e. all of these answers
Savannas might be created by human-caused fires
Indicate whether the statement is true or false.
What has caused the Aral Sea to shrink dramatically over the past 40 years?
A) global climate change B) water diversions in streams feeding the sea C) excessive growth of shoreline plants due to excessive agricultural fertilizer runoff D) extremely high evaporation rates
An isoline that connects all points of highest mean temperature on a world map is called
A) an isobar. B) the thermal equator. C) the highest mean temperature isoline. D) the temperature range line. E) min/max line.