Вопрос № 237734 - Английский язык

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Steel is downgraded from prime to lower quality material when processed.

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What is steel as a construction material? Steel may be classified as iron with the controlled amount of carbon. The amount of carbon in steel is generally less than 1.7 per cent. Ordinary structural steel should contain less than three tenth of one per cent carbon. This kind of steel also contains small amounts of phosphorus, sulfur, oxygen, nitrogen and silicon. Like iron and its alloys, steel belongs to ferrous metals. It is hard substance. Accordingly, it can be pulled, forged and melted. Generally, steel, this strong metal, like other metals, is a good conductor of electricity. Alloyed steel and stainless steel are corrosion-resistant kinds of steel.
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Steel belongs to …

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Soil organisms have nothing to do with above-ground animals.

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The first country to recycle waste paper was the USA.

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Industrial development could impact certain species by air pollution.

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Greenpeace is an environmental movement making efforts to protect the biosphere.