Tuff
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Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash lithifies into solid rock. Rock that contains greater than 75% as
Tuff from the Guadalupe Formation in Luzon, Philippines
Cliff face of welded tuff pockmarked with holes — some natural, some man-made — from Bandelier National Monument, New Mexico
Etruscan tuff blocks from a tomb at Banditaccia, Italy
A house constructed of tuff blocks in Rieden, Rhineland-Palatinate, in the Volcanic Eifel region, Germany
Tephra
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Tephra is fragmental material produced by a volcanic eruption regardless of composition, fragment size, or emplacement mechanism.
Tuff
…Lava, the name of magma when it emerges and flows over the surface Tephra, particles of solid material of all shapes and sizes ejected and thrown through the air Tephra is made when magma inside the volcano is blown apart by…
Volcanic tephra at Brown Bluff, Antarctica (2016)
Tephra horizons in south-central Iceland: The thick and light-coloured layer at the centre of the photo is rhyolitic tephra from Hekla.
Molten lava fountain at Kilauea volcano on Hawaii, with black cloud of associated tephra
Rocks from the Bishop tuff, uncompressed with pumice on left; compressed with fiamme on right