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。
3
Nitrates are chemicals that occur naturally in water and the soil.