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The crystal shape of a snowflake depends on several parameters, including temperature. In this applet, you can explore how snowflake crystal shapes depend on temperature -- click repeatedly in one of the temperature zones (between the lines). Then move your cursor to a different temperature zone and click some more. You may combine up to 3 different shapes before resetting (by clicking below the cloud).
This applet is Copyright © 2008, 2011 and 2013 by Tom Whittaker. Snowflake and cloud images by S.V. Medaris. Physics adapted from K.C. Young Microphysical Processes In Clouds Oxford Univ Press (1993), and from Bob Crowder, The Wonders of the Weather Australian Govt Publishing Service (1995).