CHAPTER 9 - CHAPTER 9 WATER: HYDROLOGIC CYCLE AND HUMAN USE...

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CHAPTER 9 WATER: HYDROLOGIC CYCLE AND HUMAN USE I. Unique Properties of Water A. Water has Unique Properties 1. Superior Solvent 2. High Melting and Boiling Point 3. High Heat Capacity 4. High Heat of Vaporization 5. Capillary Action (from high surface tension and high wetting ability) 6. Liquid Water Density Greater than Solid Water II. Water Cycle A. A global cycle by which water flows through terrestrial, aquatic and atmospheric environments. B. Helps purify and distribute water around the planet. C. The cycle 1. Evaporation - energy input (evaporative cooling), the purification process 2. Condensation - energy released (heat is being moved around the planet) 3. Precipitation - air temperature, removal of pollutants from the atmosphere.
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Fig. 9.1 Freshwater constitutes only 0.77% of the total Earth's water. Fig. 9.3 The Earth's fresh waters are replenished as water vapor enters the atmosphere by evaporation or transpiration from vegetation, leaving salts and other impurities behind. As precipitation hits the ground, note that three additional pathways are possible.
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As warm, moist air is cooled, the amount of water it can hold decreases. Cooling air beyond the point where relative humidity (RH) reaches 100% forces excess moisture to condense, forming clouds. Further cooling and condensation results in precipitation. Fig. 9.5a
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CHAPTER 9 - CHAPTER 9 WATER: HYDROLOGIC CYCLE AND HUMAN USE...

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