Why is soil considered a non-renewable resource?

The soil covering the surface of the earth has taken millions of years to form,

and we must learn to respect it. Soil is formed at a rate of only 1 cm every 100

to 400 years, and it takes 3,000 to 12,000 years to build enough soil to form

productive land. This means that soil is a nonrenewable resource and once

destroyed, it is gone forever.