On the deep sea floor, they comprise the majority of animal biomass, reaching up to 95% in some areas.

在深海海底，它们构成了动物生物量的大部分，在某些地区高达 95%。

These rocks contain rare earth minerals, and right now there are companies that are building bulldozers that would be capable of mining the deep sea floor for those rocks.

这些岩石含有稀土矿物，现在有些公司正在建造推土机， 能够在深海海底开采这些岩石。