9. Ответьте на следующие вопросы.

1. Where does raw natural gas come from?

2. What is termed sweet gas?

3. What is natural-gas processing?

4. Where does natural-gas processing begin at?

5. Are oil and natural gas often found together in the same reservoir?

6. Natural-gas processing plants are used to purify the raw natural gas, are not they?

7. What does the composition of the raw natural gas depend on?

8. What gas is classified as “associated-dissolved” and “non-associated”?

9. When must natural gas undergo processing?

10. The processing of natural gas is very important for petroleum industry, isn’t it?