IELTS Writing Task 1: process diagrams 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 things that make process descriptions special: Phrases that order the process and link the steps (underlined) Passive verbs (highlighted) (See Cambridge IELTS book for the full question)