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Author Question: According to the Soil Conservation Service, it takes about ____ to form topsoil from the subsoil ... (Read 91 times)

jparksx

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on: Jul 21, 2018
According to the Soil Conservation Service, it takes about ____ to form topsoil from the subsoil parent material.
 
  a. 15 years c. 25 years
  b. 20 years d. 30 years

Question 2

Chlorinated hydrocarbons such as chlordane, toxaphene, and DDT could last ____ or more in the soil.
 
  a. 5 years c. 80 years
  b. 20 years d. 100 years


connor417

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Reply #1 on: Jul 21, 2018
Answer to Question 1

D

Answer to Question 2

B


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