The diagram below shows 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 1st pictorial diagram illustrates the phases and equipment used in the

cement

-making process and 2nd pictorial diagram shows how it is

then

used for

production

Correct article usage

the production

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concrete

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of concrete

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for building purposes.

Overall

, limestone and clay pass through four stages before being bagged

ready

Correct word choice

and ready

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for use as

cement

which

then

accounts for 15% of

four

Correct article usage

the four

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materials used to produce concrete.

While

the process of making

cement

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

cement

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

This

powder is

then

combined in a mixer before passing into a rotating heater which has constant heat applied at one end of the tube. The resulting mixture is ground in order to produce

cement

. The final product is afterwards put into bags ready to be used. Regarding the

second

diagram, concrete consists of mainly gravel, which is small stones, and

this

makes up 50

percent

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per cent

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

cement

(15%) and water(10%). These are all poured into a concrete mixer which continually rotates to combine the materials and ultimately produces concrete.