Q: What resource is considered nonrewable for human purposes, because it takes so long to form and is depleted by farming and other activities?


Read this paragraph and choose the correct option from the provided answers:

Although renewable, soil takes a very long to form—up to hundreds of millions of years. So, for human purposes, soil is a nonrenewable resource. It is also constantly depleted of nutrients through careless use and eroded by wind and water. For example, misuse of soil caused a huge amount of it to simply blow away in the 1930s during the Dust Bowl (see Figure below ). Soil must be used wisely to preserve it for the future. Conservation practices include contour plowing and terracing. Both reduce soil erosion. Soil also must be protected from toxic wastes.

 Choices:

- water

- acid

- sunshine

- soil


A:
soil