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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.