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Chapter 7 Review Question Answers

Chapter 7 Review Question Answers - Chapter 7 Responses to...

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Chapter 7, Responses to Review Questions ______________________________________________________________________________ 1. Sources of cloud condensation nuclei (CCN) include wind erosion of soil, salt crystals from sea spray, volcanic eruption, agricultural activities, and industrial emissions. 2. Cloud droplets are described as "supercooled" if their temperature is below the usual freezing point of water (0 °C) and yet the droplets remain liquid. 3. Hygroscopic nuclei are small particles that have a special chemical affinity (attraction) for water vapor. In the atmosphere, they promote condensation and cloud formation at values of relative humidity under 100%. 4. Clouds may be classified according to their general appearance (e.g., stratiform, cumuliform, cirriform), altitude of cloud base (i.e., high, middle, low, clouds with vertical development), temperature (i.e., cold clouds, warm clouds), and composition (i.e., ice crystals, supercooled water droplets, water droplets, mixture). 5. Air temperature usually falls with increasing altitude and determines whether a
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