Increasing the price of petrol is the best way to solve growing traffic and pollution problems. To what extent do you agree or disagree? What other measures do you think might be effective?

The picture given on the left tells the procedure of producing

cement

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and the tools used in the making

process

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,

while

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the image on the right illustrates the

process

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of creating concrete using

cement

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In summary, producing

cement

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requires two main raw materials and must go through five general stages. Meanwhile, making concrete only requires one step and four ingredients. Looking at the

cement

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production

process

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map, in the first step, limestone and clay are put on the crusher to be turned to powder form.

Then

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, the powder is delivered to the

mixer

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to make the limestone-clay mixture. After going through the

mixer

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, the powder-form mixture is conveyed to the rotating heater and

then

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to the grinder to finish off the making

process

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. The resulting product,

cement

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will

then

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be packaged into bags.

According to

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the concrete-making procedure diagram, we are able to tell the major material is stones, to be more precise, small stones, as they make up one second of the concrete mixture. The other ingredients are 20% sand, 15%

cement

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, and 10% water. After the correct proportion of substances is added to the concrete

mixer

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, the

mixer

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will start rotating, mixing the materials together. Concrete is

then

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produced.