Hydrologic

Hydrologic The hydrologic cycle is a rotation of water exchange between the land, the ocean, and the atmosphere on earth. It is an amazing fact that water circulates without any loss of water. ¡°Hydrologic cycle includes evaporation form the sea, movement of water vapor over the land, condensation, precipitation, surface runoff, subsurface runoff, and so on¡±. (p.189) Because it is a complex and long process, humans did not recognize what was exactly going on until recent times. Talking about how humans developed the idea of the hydrologic cycle, we begin with the ideas of people from the sixteenth century. They believed that water discharged by springs and streams could not be derived form the rain, for two reasons. The first reason was that rainfall was treated as inadequate in quantity. The other reason was that they believed the earth was too impervious to permit penetration of water very far below the surface. (p.190) However, people from even earlier ages, the ancients, knew that the ocean never overflowed. So they figured that was why the rivers flowed to the oceans. One thing the ancients wondered about was how the water got into the rivers water, rivers, cycle, sea, hydrologic, theory, earth, scientist, ocean, model, form, whence, vinci, times, springs, rainfall, p190, leonardo, land, ideas, humans, developed, da, century, about, time, theologians, surface, sixteenth, seventeenth, seas, runoff, rotation, reason, rain