The following paragraph describes the process of making cement.
At the first stage in the cement production process, limestone and clay are crushed to form a powder. This powder is then mixed and passed through a rotating heater. The resulting mixture is ground, and finally the end product, cement, is packed into large bags.
There are 2 things that make process descriptions special:
- Phrases that order the process and link the steps (underlined)
- Passive verbs (highlighted)
(See Cambridge IELTS book 8 for the full question)