Band 9: Task 1: The diagrams below show the stages and equipment used in the cement- making process, and how cement is used to produce concrete for building purposes. Summarise the information by selecting and reporting the main features, and make comparison where relevant.

The diagrams illustrate the stages involved in producing cement from raw materials and the subsequent process of manufacturing concrete for construction purposes.

Overall, cement production is a multi-stage industrial process that converts limestone and clay into bagged cement through crushing, mixing, heating and grinding. In contrast, concrete production is a simpler mixing process that combines cement with water, sand and gravel in fixed proportions.

In the cement production process, limestone and clay are first fed into a crusher, which breaks them down into powder. This powder is then transferred to a mixer. The mixed material next enters a rotating heater, where it is subjected to heat. After heating, the substance is passed through a grinder before being packed into bags as finished cement.

For concrete production, four ingredients are combined in a concrete mixer: cement (15%), water (10%), sand (25%) and gravel (50%, defined as small stones). These materials are thoroughly mixed inside the rotating mixer to produce concrete ready for building use.