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Metals are materials most widely used in industry because of their properties. The study of the production and properties of metals is known as metallurgy.

The separation between the atoms in metals is small, so most metals are dense. The atoms are arranged regularly and can slide over each other. That is why metals are malleable (can be deformed and bent without fracture) and ductile (can be drawn into wire). Metals vary greatly in their properties. For example, lead is soft and can be bent by hand, while iron can only be worked by hammering at red heat.

The regular arrangement of atoms in metals gives them a crystalline structure. Irregular crystals are called grains. The properties of the metals depend on the size, shape, orientation, and composition of these grains. In general, a metal with small grains will be harder and stronger than one with coarse grains.

Heat treatment such as quenching, tempering, or annealing controls the nature of the grains and their size in the metal. Small amounts of other metals (less than 1 per cent) are often added to a pure metal. This is called alloying (легирование) and it changes the grain structure and properties of metals.

All metals can be formed by drawing, rolling, hammering and extrusion, but some require hot-working. Metals are subject to metal fatigue and to creep (the slow increase in length under stress) causing deformation and failure. Both effects are taken into account by engineers when designing, for example, airplanes, gas-turbines, and pressure vessels for high-temperature chemical processes. Metals can be worked using machine-tools such as lathe, milling machine, shaper and grinder.

The ways of working a metal depend on its properties. Many metals can be melted and cast in moulds, but special conditions are required for metals that react with air.

Now London is one of the biggest cities in the world. Its population is about 8 million people. It's not only a capital of Great Britain, it's a large business and commercial centre. London stands on the Thames.
As an ancient city London has a great number of places of historic interest. They attract tourists from all the world.
London is traditionally divided into four main parts. They are Westminster, the City, the West End and the East End.
Westminster is the historical area in London. Famous monuments and buildings are there. One of the most beautiful places is Westminster Abbey.
Many greatest poets and writers are buried there. Chauser, Dickens, Kipling are among them. Newton and Darwin are buried there too.
Another place which is worth seeing in London is the Tower. In different times this castle was a fortress, a royal palace, a prison. Now it is a museum.
London is rich in famous palaces. Buckingham Palace is the official residence of the Queen. Westminster Palace is the seat of the British Parliament.
The greatest of English churches is St. Paul's Cathedral. It was built by a famous English architect, Sir Christopher Wren.
Trafalgar Square is considered to be the very centre of London. In the middle of it stands the monument to admiral Nelson.
London is famous for its streets and squares as well. Fleet Street is known for the newspaper offices situated there. Regent Street is famous for the richest shops and supermarkets.
Speaking about London it is impossible to say nothing about its museums. The British Museum shows works of art from ancient Asia, Egypt, Rome and Greece side by side with those of Great Britain and other countries.