9. Ответьте на следующие вопросы.

1. What is natural gas?

2. Where is it found?

3. Why must gas undergo processing?

4. What do the by-products of processing include?

5. Unwanted natural gas was a disposal problem in the active oil fields, wasn’t it?

6. What must be removed before the natural gas can be transported?

7. Is natural gas a pure product?

8. What is called associated gas?

9. Natural gas liquid has a good commercial value, has not it?

10. What does natural gas contain?