Volcanic ash looks similar to the ash resulting from the combustion of wood, but it is not a product of combustion.
When the volcanic ash rains down to the ground, it forms a layer of tuff.
... Michel, (born 1942), author
Trenchard, Hugh, (1873-1956)
Trench, Richard Chenevix, (1807-1886), clergyman, philologist
Trenter, Stieg[?], Swedish writer
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