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Silesia is a historical region of Central Europe located mostly in present-day Poland, with parts in the Czech Republic and Germany....

A city is a relatively large and permanent settlement, particularly a large urban settlement. Although there is no agreement on technical definitions distinguishing a city from a town within general English language meanings, many cities have a particular administrative, legal, or historical status...

Katowice is a city in Silesia in southern Poland, on the Kłodnica and Rawa rivers . Katowice is located in the Silesian Highlands, about 50 km on north from the Silesian Beskids and about 100 km on south-east from Sudetes Mountains.It is the central district of the Metropolitan...

Katowice is a city in Silesia in southern Poland, on the Kłodnica and Rawa rivers . Katowice is located in the Silesian Highlands, about 50 km on north from the Silesian Beskids and about 100 km on south-east from Sudetes Mountains.It is the central district of the Metropolitan...

Area is a quantity expressing the two-dimensional size of a defined part of a surface, typically a region bounded by a closed curve. The term surface area refers to the total area of the exposed surface of a 3-dimensional solid, such as the sum of the areas of the exposed sides of a polyhedron...

In biology, a population is the collection of inter-breeding organisms of a particular species; in sociology, a collection of human beings. Individuals within a population share a factor may be reduced by statistical means, but such a generalization may be too vague to imply anything...

The density of a material is defined as its mass per unit volume. The symbol of density is ρ .- Formula :Mathematically:where: is the density, is the mass, is the volume....