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  • 1. Introduction Water Definition Water Cycle Definition Water processes • Evaporation • Precipitation • Runoff
  • 2. • Water covers 71% of the Earth's surface, is vital for all known forms of life. • Safe drinking water is essential to humans and other lifeforms
  • 3. • Water is a chemical compound with the chemical formula H2O. A water molecule contains one oxygen and two hydrogen atoms.
  • 4. • The water cycle (known scientifically as the hydrologic cycle) refers to the continuous exchange of water within the hydrosphere, between the atmosphere, soil water, surface water, groundwater, and plants. • Water on Earth moves continually through the watercycle of evaporation and transpiration, condensation, precipitation, and runoff, usually reaching the sea.
  • 5. Evaporation PrecipitationRunoff
  • 6. • Evaporation from oceans and other water bodies into the air and transpiration from land plants and animals into air. • Most water vapor over the oceans returns to the oceans, but winds carry water vapor over land at the same rate as runoff into the sea
  • 7. • Precipitation, from water vapor condensing from the air and falling to earth or ocean. • Precipitation, has several forms: most commonly rain, snow, and hail, with some contribution from fog and dew. Dew is small drops of water that are condensed when a high density of water vapor meets a cool surface.
  • 8. • Runoff from the land usually reaching the sea. • Water runoff often collects over watersheds flowing into rivers. • Through erosion, runoff shapes the environment creating river valleys and deltas whic h provide rich soil and level ground for the establishment of population centers