Stephen : - By the way, what does the term “hydrologic cycle” mean? Can you explain it? Martin : - Basicly it means that water cycles from the oceans and land to the atmosphere, and then back to the oceans, and land. It is a complex cycle, which provides us with a renewable supply of purified water on land. Stephen : - ---- Martin : - Certainly, and also an important one. As you might expect, forests release substantial amounts of moisture into the atmosphere by transpiration, which then falls as precipitation.