Image: Graupel animation 3a
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Graupel_animation_3a.gif (320 × 240 pixels, file size: 292 KB, MIME type: image/gif, looped, 39 frames, 3.9 s)
Description: When the rising ice crystals collide with graupel, the ice crystals become positively charged and the graupel (soft hail) becomes negatively charged.
Title: Graupel animation 3a
Credit: http://www.lightningsafety.noaa.gov/science/science_electrification.shtml
Author: U.S. government. Noaa.gov
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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