Frostskjelv

Frostskjelv oppstår når bakken er mettet med vann, og det skjer et hurtig temperaturfall til under frysepunktet. Vannet utvides når det fryser og lager dermed små sprengninger av jord og stein. Dette kan skape ganske så høylytte og kraftige ristinger i bakken. Lyden ligner et pistolskudd. Noen ganger dannes det også synlige sprekker i bakken.

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