The colonising powers´ colours were wiped off the map by the nations fighting to regain their independence.
The dromedary is an indispensable animal for inhabitants of the deserts.
The products of oil refining include diesel oil, petrol and lubricants.
Solar power stations convert solar energy into electricity.
A metropolis is a large city with a population of over 1 million people.
The purpose of the electricity supply network is to provide electricity for consumers.
The Space Shuttle was a manned, reusable spacecraft operated by NASA.
Satellites orbiting the Earth can be used for civilian or military purposes.
This animation demonstrates instruments used to examine atmospheric phenomena.
The Channel Tunnel is a 50.5 km long railway tunnel between the United Kingdom and France, beneath the English Channel.
The Earth is divided into 24 time zones. Standard time is the time used within time zones.
The design and structure of modern houses play an important role in environmental protection.
The Voyager space probes were the first man-made objects to leave the Solar System. They gather data about outer space and carry information about humanity.
Raw iron is produced from iron ore in iron smelters.
Treated sewage water can be used in agriculture and industry.
As opposed to underground mines, in open-pit mines the layers covering coal are removed, coal is extracted on the surface.
Tidal power stations utilise the daily fluctuation of the water level for producing electricity.
Hero of Alexandria is the inventor of the first steam engine, although he regarded it as an entertaining toy.
This animation demonstrates the geographical locations of the Earth's major cities.
The main protagonists of World War II were tanks.