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Power generation

What type of solar system relies on the natural convective circulation of water?
A. concentrated solar, B. thermosyphon
C. active closed loop, D. amorphous silicon cell


B. thermosyphon is the passive solar system described.
A. uses mirrors to concentrate the sun's radiation; C. is thermal, but requires pumps and valves to move the water; D. is material used in a type of thin-film photovoltaic cell.

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