They say the biggest risk comes from the volcano's snow cap melting and trigering massive floods and mudflows.

他们称火山最大风险是让雪盖融化并导致大规模洪水和泥流。

The city was buried in an angry torrent of mud 10 feet deep.

这座城市被埋在 10 英尺深愤怒泥流中。

It's located in the southwestern part of Colombia and the flooding washed a stream of mud into Mocoa.

它位于哥伦比亚西南部，洪水将一股泥流冲进了莫科亚。

A mixture of mud, water, and other debris, called a lahar, can flow down and bury nearby cities.

泥浆、 水和其他碎屑混物， 称为火山泥流， 会流下来并掩埋城市。

The fossil—dated to about 125m years ago, during the Cretaceous period—was formed when a flow of boiling volcanic mud engulfed two animals seemingly locked in mortal combat.

这块化石可追溯到大约12500万前白垩纪时期，当时沸腾火山泥流吞没了两只似乎陷入殊死搏斗动物。