dead soil covering 枯枝落叶层
We can tear apart the great grass cover of the western plains and pour toxic chemicals into the soil until the soil is dead and blows away in the wind.
我们可以把西部平原上覆盖的大片草地撕开，然后把有毒的化学物质倒入土壤中，直到土壤枯死，被风吹走。
There are bacteria that help plants grow,others that get rid of dead animals and plants by making them decay,and some that live in soil and make it better for growing crops.
有些细菌能帮助植物生长，另一些细菌则通过腐蚀来消除死去的动物和植物，还有一些细菌则生活在土壤里，使土壤变得对种植庄稼更有好处。
They endure for several weeks in moist soil and dead animal tissues.
它们在潮湿的土壤和死亡的动物组织中能生存数星期。
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