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Fragments of pulverised rock, minerals and volcanic glass created due to the heat and explosive power of the volcanic eruption. Once in the air, the ash can be transported over very large areas depending on prevailing winds and the height of the ash column. A downslope flow of volcanic debris, either dry or mixed with water as a mud flow. There are most likely to occur when a crater lake or ice-dammed lake overflow. They may also be as a result of sudden snowmelt caused by the increased heat given off by the volcanic eruption. These have been known to travel at speeds of 60mph. Large boulders that are ejected from the volcano can cause free standing rocks to travel downslope causing considerable damage. A block of lava ejected into the air from a volcano. As it is thrown out, it cools and spins, causing the block to be rounded or decorated with spiral patterns. When they return to earth they may result in further hazards.