Natural Science CLEP Prep Practice Exam

The primary source of energy driving the water cycle is solar energy. Solar energy from the sun causes water evaporation from bodies of water, which then leads to condensation and precipitation in the form of rain or snow. While wind, rain, and tides play important roles in the water cycle, they are not the primary source of energy driving it. Wind can transport water vapor, rain can contribute to precipitation, and tides can influence ocean currents, but ultimately it is solar energy that powers the water cycle.