Same soil pollution problem exists today in the Indus Valley in Pakistan 6

_____ he is enjoying listening to music now? 7. the ancient

Sumerian cities had collapsed largely because of crop failure due to high

soil salinity? 8. ____ it is necessary for most plant growth? 9.

this process leaves the soil sterile and dependent upon fertilizer to support plant growth?

Exercise 10. Change the following sentences, active to passive, passive to active.

It is formed during a long process that may take thousands of years. 2. These cities had collapsed largely because of crop failure due to high soil salinity. 3. This process leaves the soil sterile and dependent upon fertilizer to support plant growth. 4. All students enjoyed the film except for me. 5. These results in heavy fertilizer increase polluted runoff into lakes and streams. 6. These results in heavy fertilizer increase polluted runoff into lakes and streams. 7. Improper irrigation practices in areas with poorly drained soil may result in salt deposits that inhibit plant growth. 8. Even beneficial micro organisms are indiscriminately killed with this process. 9. These actions may lead to crop failure. 10. Treating the soil with chemical fertilizers, pesticides, and fungicides interferes with the natural processes occurring within the soil. 11. This process destroys useful organisms such as bacteria, fungi, and other micro organisms.