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This cross section clearly shows the rings of successive growth of the hailstone, much as the rings of a tree document its age. Hail is created by strong updrafts, typically in thunderstorms. Large hailstones usually alternate between hard, clear layers (made of solid ice, these layers form when the hailstone encounters moisture that spreads across the stone before freezing) and softer, milky layers (these form in a colder environment as moisture freezes on contact, trapping tiny air bubbles as it freezes). © University Corporation for Atmospheric Research. Want to know more about weather? Go to JetStream - an Online School for Weather.