. Elementary physical geography . Fig. 59. Photograph taken after a fall of damp snow, showing how itclings to vegetation. those accompanying thunderstorms and tornadoes. Theyare usually oval or rounded in form, and are often madeof successive shells of clear and clouded ice. The mode offormation is not known; but there is some reason for believ-ing that they are formed in violently moving and rising aircurrents, and that this is the reason why they so commonlyfall on the margins of rather violent storms.

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