Natural Science CLEP Prep Practice Exam

The water cycle involves the constant movement of water between the Earth and the atmosphere. One of the key processes driving this cycle is evaporation, which occurs when water is heated by the sun and turns into water vapor. Option A, pressure, does not play a significant role in driving the water cycle. Option C, capillary action, refers to the movement of water through small spaces, such as in plants and soil, and is not a force that drives the water cycle. Option D, temperature, is related to evaporation but is not the force that drives it. Therefore, option B, evaporation, is the most accurate answer.