| A. There are only 2 layers of soil. |
| B. It takes 5 years to form one inch of topsoil. |
| C. A typical healthy soil sample contains 25% water |
| D. Soil stores 10% of the world's carbon dioxide emission. |
A) TFTF
B) FTFT
C) TTFF
D) FFTT
Correct Answer: D
Solution :
There are four layers of soil, top soil, sub soil, small rocks, and bed rock. It takes over 500 years to form one inch of top soil.
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