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As the above, volcanic ashes are weathered and transmuted into diverse states and components at various environmental conditions, they contribute to our life.
Especially, comparatively new volcanic ashes have been industrially applied.
Besides, volcanic ashes that about 5000 years have passed from an eruption have best adsorption.
Moreover, weathered volcanic ashes turn out to be suitable for agriculture because of its fertilizing effects.
As more than times go, they are transmuted into tuffs and zeolites.
They are effective in cereal cultivation including rice crop.
Unexpectedly, it has been overlooked that volcanic ashes were temporally, gradually transmuted into different features from original states through weathering.
〈 Ref 〉
「The Asymptotic Behavior of Coordination Sequences for the 4-connected Nets of Zeolites and Related Structures」
by M.O' Keeffe, S.T.Hyde
in 'Z.Kristallogr' Vol.211 ( 2 ) p.73 〜 78
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