Figure 1 GENERALIZED CONCEPTS: DIMENSIONS OF CLOUD AND STEM DISTRIBUTION OF ACTIVITY 4 PERCENTAGE of TOTAL ACTIVITY |-—___—_ 100 MILES ——_—__——_-| 4 STRATOSPHERE 30,00050,000 FEET q 10,000 FEET TROPOPAUSE ———> | TROPOSPHERE ee 40,00060,000 FEET STEM GROUND MEAN OF PARTICLE SIZES (MICRONS)

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