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Glossary of Terms

Hydrologic Cycle
The hydrologic cycle is the circulation of water between biosphere, atmosphere, and the rest of the earth. Water travels through several methods – evaporation, condensation, precipitation, etc. – between oceans, rivers and freshwater systems, surface vegetation, clouds, snow, ice, soil, and other reservoirs. The hydrologic cycle has a major impact on the climate. One problem with global warming and climate change is that the greenhouse gas carbon dioxide begins to hold more water vapor in the air. Water vapor captures and intensifies heat, making the greenhouse effect even worse. The net effect is that hydrologic cycle is thrown out of balance. When the cycle is disturbed, one consequence is drought. Another is unseasonal precipitation and extreme weather. A warmer, wetter atmosphere is more volatile, and less able to regulate the temperature fluctations that result in stormy weather.
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