Discussion
........................... deposits are formed from cloud of ash that move out horizontally from a vent at hurricane velocities following a volcanic explosion.
Answer: D
These are surge deposits.
A pyroclastic (base) surge is a turbulent, low-density cloud of ash and gas that moves out horizontally from the vent at very high speed after a volcanic explosion, often in phreatomagmatic eruptions. Its deposits are thin, cross-bedded and dune-like, and they mantle the topography.
Air-fall deposits settle vertically out of an eruption column. Solfataras are vents emitting sulphurous gases, not deposits from an ash cloud. 'Blister' is not a type of pyroclastic deposit.
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