The elements are contained in layers of mud ranging in thickness from 2 meters to 70 meters that have accumulated on seabeds 3, 500 meters to 6, 000 meters deep.
在3500至6000米深的海床上，蓄积着2到70米厚的海底淤泥层，稀土元素就储藏这些泥层里。
They accumulated a large amount of river mud for fertilizer.
他们堆积了大量河泥用作肥料。
Such geological disasters destroyed forests and vegetation accumulated massive loose debris layer, which also can lead to large-scale mud-rock flows after the rains.
由地震所引发的次生地质灾害毁坏了森林和植被，堆积了大量松散的碎屑层，这也为地震后降雨诱发泥石流和滑坡提供了丰富的物质来源。
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