Millions of years later, a thick deposit of rich fertile soil has formed in the delta.
数百万年之后，在三角洲地区沉淀了一层厚厚的沃土。
High rates of evaporation deposit thick layers of salt minerals, such as common table salt and gypsum (a chalky mineral that is a major component of wallboard).
极高的蒸发率使厚实的盐矿逐渐沉积，包括食用盐和石膏层(一种白垩矿，是墙板壁的主要成分)。
Worse, below it was a not-very-firm glacial deposit hundreds of meters thick.
更坏的是，在它下面是不很坚固的数百米厚的冰状沉积。
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