锰铁合金渣具有潜在的水硬性和火山灰性，可用作混凝土掺合料和水泥混合材料。

Ferromanganese slag has the latent hydraulicity and volcanic ash, it can be used to build concrete admixtures and cement.

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此外，高火山灰性(凝硬性)灰可以通过控制燃烧来产生，此时，二氧化硅保持在非结晶形式和蜂窝状结构。

In addition, highly pozzolanic ash can be produced by means of controlled combustion, when silica is kept in non-crystalline form and cellular structure.

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至于气温突降的原因，最具代表性的观点认为是由于天体冲撞或大规模火山喷发激起的火山灰和尘土。

As to what caused these cold snaps, the ever-popular suspects are ash and dust kicked up by either astronomical impacts or massive volcanism.

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