tsunami - large waves formed by large undersea landslides commonly caused by earthquakes. From the Japanese word for seismic sea wave. (misnamed tidal wave, though it has nothing to do with tides.)
tuff - volcanic ash hardened by pressure or from natural cements deposited from water that seeps through the ground.
volcanic - pertaining to a volcano
volcaniclastic - refers to the clastic rocks composed of volcanic particles.
volcanic ash - fragmental pieces of glass, vcrystals, and rock fragments, less than 0.4 inchin diameter, extruded by volcanoes.
volcanic sandstone - a rock composed mostly of sand0sized volcanic particles.
Bibliography
Out of the Crater: Chronicles of a Volcanologist, Richard V. Fisher, Princeton University Press, 1999
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