or log in
A gradual outflow of residents from the centre of the city towards the surrounding areas.
Automobiles have evolved a lot since the late 19th century.
Hovercraft are capable of travelling at high speed above the surface of water.
Raw iron is produced from iron ore in iron smelters.
This lesson presents how solar energy can be utilised.
Industrial estates provide infrastructure and services for companies.
This animation demonstrates the main sources of soil pollution.
The design and structure of modern houses play an important role in environmental protection.