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Where is the modern city, most of whose inhabitants live in caves? Detailed answer

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Where is the modern city, most of whose inhabitants live in caves?

The Australian city of Coober Pedy, which is one of the world's largest centers for the extraction of opals, is located in a desert and very hot area. Of the 2 people in the population, most live in underground caves, which remain after the development of mines. Full-fledged apartments have been made there, communications have been laid.

In addition, many urban sites are located in the caves, including a cemetery and churches.

Authors: Jimmy Wales, Larry Sanger

 Random interesting fact from the Great Encyclopedia:

What is nickel?

Nickel is found in many alloys that are widely used in hundreds of industries. It is one of the most useful metals known to man. But in the old days, when chemists tried to work with him, he gave them a lot of trouble. After all, it is not for nothing that the name "nickel" comes from the German word meaning "imp"!

Nickel is found in meteorites, and sometimes - in small quantities - it is found in a free state. But the largest reserves of nickel are found in certain deposits, in particular in pyrrhotite (pyrrhotite is a mineral containing iron, copper and nickel). Canada is the largest producer of nickel.

Nickel-containing ore is usually smelted in blast furnaces to produce an enriched mixture called matte. Nickel is then smelted from this mixture in a blast furnace. Nickel is a silvery, shiny metal that can be forged, that is, easily processed. In addition, nickel is one of the most magnetizable metals when unheated.

We seldom see pure nickel except when it is used to coat other metals. This is called nickel plating. It protects metals from rust and loss of luster, increases their wear resistance. Most of the nickel produced is used in alloys. For example, in an alloy with copper, it is used to make coins. Therefore, the US nickel is called a "nickel".

When alloyed with three parts copper and one part zinc, nickel forms a light silvery metal known as nickel silver, which is used to make cutlery and as a base for silver-plated objects. But a relatively small fraction of the nickel is used in this way. Basically, it goes to the manufacture of alloys with steel, which can withstand constant loads.

These alloys are used in the construction of bridges, railways, in the manufacture of rivets, boilers for locomotives, automobile gearboxes and axles, teeth for excavator buckets.

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