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Producing speech requires the synchronised operation of several cortical centres.
A white, water-soluble, sweet compound known as sugar.
The colonising powers´ colours were wiped off the map by the nations fighting to regain their independence.
The city with advanced culture was the first settlement in history to have a citadel.
The urinary system serves for the removal of harmful and useless materials from the body.
Atmospherical nitrogen is bound by bacteria and used by living organisms in the form of various compounds.
Tidal power stations utilise the daily fluctuation of the water level for producing electricity.
Neptune is the outermost planet of the Solar System, the smallest of the giant planets
As opposed to underground mines, in open-pit mines the layers covering coal are removed, coal is extracted on the surface.
Karst formations include dolines and dripstones.
The German triplane was perhaps the best known plane in World War I.
Treated sewage water can be used in agriculture and industry.
Raw iron is produced from iron ore in iron smelters.
The Earth is divided into geographical and climatic zones, which result in the zonation of vegetation.
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.
Neurons are cells specialised for transmitting electric signals.
The boundaries of tectonic plates can be seen on the seafloor.
Archimedes was one of the most brilliant Greek scholars of ancient times, who made his mark with military inventions as well.
Nuclear propulsion was first used by the US Navy for powering submarines in the mid-20th century.
A cuboid is a polyhedron with six rectangular faces.