III. Match the meaning of the terms with their definition.

Wood, concrete, stone, iron, steel

1 The hard, compact mineral material of which rocks are made up.

2 The hard, fibrous substance beneath the bark of trees and shrubs.

3 An alloy of iron and carbon.

4 A mixture of cement, sand, gravel and water that hardens as it dries.

5 The commonest and most useful metal, from which tools and machinery are made.

IV. Insert the words and translate the sentences.

Ductility, strength, steel, dactile, form, yield, cast iron, difference

Amongst bridge materials … has the highest and most favourable strength. It is therefore suitable for the most daring bridges with the longest … A special merit of steel is its … due to which it deforms considerably before it breaks, because it begins to … above a certain stress level. For bridges high … steel is often preferred. The higher the strength the smaller the proportional … between the yield strength and the tensile strength. This means that high strength steels are not as … as those with normal strength. For building purposes, steel is fabricated in the … of plates by means of rolling when red hot for bearings and some other items … is used for members under … only, like ropes or cables there are special steels

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