The sun is the primary source of energy that drives all the biogeochemical cycles on earth. which statement best describes how the sun’s energy powers the water cycle? a. plants require energy from the sun to perform photosynthesis. b.the sun's heat reflects off ice sheets near the polar caps, reducing the overall temperature of earth. c.heat from the sun drives evaporation, turning water on earth's surface into water vapor. d.energy from the sun provides the warmth necessary for cold-blooded animals to survive.