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 comparisons where relevant.

The diagrams illustrate the steps and equipment involved in the production of

cement

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and the way in which

cement

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is

then

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used to make concrete.

Overall

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, limestone and clay pass through four stages before being

bagged

Punctuation problem

bagged,

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ready for use as

cement

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.

Cement

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is

then

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combined with three other materials to create concrete.

While

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the process of making

cement

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uses a number of tools, the production of concrete is simpler and requires only a concrete mixer. In the first stage of making

cement

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, limestone and clay are crushed together to form a powder using a crusher.

This

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powder is

then

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combined in a mixer before passing into a rotating heater

which

Punctuation problem

, which

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has constant heat applied at one end of the tube. The resulting mixture is ground in order to produce

cement

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. The final product is

afterwards

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then

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put into bags ready to be used. Regarding the second diagram, concrete consists

of mainly

Correct word order

mainly of

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gravel, which is small stones, and

this

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makes up 50% of the ingredients. The other materials used are sand (25%),

cement

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(15%) and water (10%). These are all poured into a concrete mixer

which

Punctuation problem

, which

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continually rotates to combine the materials and ultimately produces concrete.