or log in
Several different sporting events can be held in an athletics stadium.
People with a higher social position tend to separate themselves from the lower social classes....
Machinery that pumps crude oil to the surface
The population pyramid is a representation of the age and gender composition of a given country.
The main sources of water pollution are industry, agriculture and urban areas.
The purpose of the electricity supply network is to provide electricity for consumers.
This animation demonstrates the main sources of soil pollution.
There is a huge gap between the socio-economic conditions of the northern and southern...