WaterCycle 78% of rain Water Cycle—Ocean and Earth Systems 50°C cooler importance of water cycle NASA Earth Science "Water Cycle | Science Mission Directorate" NASA Earth Science The Water Cycle http://science.na...r-cycle/ NASA Earth – The Water Cycle Water Cycle | Science Mission Directorate science.nasa.gov/earth-science/oceanography/... 50°C cooler 78% of rain water cycle "Water Cycle | Science Mission Directorate" Earth’s rain cycle 78% of rain