The passage describes the process of the sun heating the surface water of the Earth, causing it to evaporate and form water vapor. This vapor then rises into the atmosphere, where it cools and condenses into small droplets. These droplets come together and grow until they become too heavy and fall back to the Earth as precipitation, such as rain. Some of the rain evaporates back into the atmosphere, while the rest infiltrates the ground and forms groundwater. This process is known as the water cycle, making option c, "Ciclo del Agua," the correct answer.