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The correct spelling is volcanic tuff instead of volcanic tuft. Volcanic ash that has been ejected from vents during eruption makes volcanic tuff.
Volcanic ash can create very fertile soil.
Tephor is a type of volcanic ash. Tephor is a type of volcanic ash.
No. Volcanic ash is harmful to inhale and can be toxic, but it is not radioactive.
No. While volcanic ash can have a basaltic composition, it usually does not. Basalt forms from lava. Volcanic ash forms tuff.