The population pyramid is a representation of the age and gender composition of a given country.
Developed countries are the engines of the world economy, and they have the highest GNP as well...
The protective embankment, or, in case of minor floods, the summer dyke ensures the protection...
A new property can be built on a completely empty area or an old building can be renovated.
Thermal power stations convert energy released during the combustion of fossil fuels or...
This animation demonstrates instruments used to examine atmospheric phenomena.
Villages established in valleys usually consisted of houses built on long and narrow plots of land.
Basketball is one of the most popular team sports.