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Keyword: water cycle
Article: The Global Reach of GPM: For Good Measure
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Article: GPM: The Fresh(water) Connection
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Video: GPM: The Fresh(water) Connection
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Download Video: 
GPM_Promo_2012_720.f4v
GPM_Promo_2012_720.f4vIn this video NASA scientists discuss why it is so important to study and track Earth's freshwater resources, and explain the purpose of the Global Precipitation Measurement mission.
Image: The Water Cycle
Image Caption:
Earth’s water continuously moves through the atmosphere, into and out of the oceans, over the land surface, and underground.
Source: NOAA National Weather Service Jetstream.
Credits:
NOAA
Article: The Global Water Cycle
How Water Moves
The water cycle describes the movement of water over, above and below the Earth’s surface. Water can easily change between any of its three states: vapor, liquid and ice. Its phase transitions among the gaseous, liquid and solid states dominate the behavior of the weather, climate and environmental systems. The way water moves between all three phases is a powerful vehicle for rearranging Earth’s energy budget.
