The 1980 volcaniceruption of Mount Saint Helens, for example, sent mud and debris into several tributaries of the Columbia River.
例如,1980年圣海伦斯火山爆发,导致哥伦比亚河的几条支流产生泥石流现象。
2
Around this time, the largest of these centers, Cuicuilco, was seriously affected by a volcaniceruption, with much of its agricultural land covered by lava.