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A sphere is the set of points which are all within the same distance from a given point in space.
Satellites orbiting the Earth can be used for civilian or military purposes.
Mercury is innermost and smallest planet of the Solar System.
Submarines had an important role in naval warfare as early as World War I.
The palace of Charlemagne was not only the centre of his empire, but also a centre of culture.
This animation demonstrates various types of cylindrical solids as well as their lateral surfaces.
A metropolis is a large city with a population of over 1 million people.
Possible traces of water and life are sought on Mars.
Jupiter is the largest planet of the Solar System, it has two and a half times the mass of all the other planets combined.
An exercise about the regular hexahedron built from unit cubes to help deepen your knowledge of cubes.
Solar power stations convert solar energy into electricity.
One of the oxoacids of nitrogen. A colourless compound with a pungent odour, a strong oxidant.
An entertaining game about different views of spatial objects.
The design and structure of modern houses play an important role in environmental protection.
A glacier is a large body of ice that forms from snow, and is in constant, slow motion.
The topmost layer of our skin is the epidermis, which contains melanocytes.
The Earth is divided into 24 time zones. Standard time is the time used within time zones.
One of the most important religious military orders, formed in the era of the Crusades.
The ancient city located near the river Euphrates was an important Sumerian centre.
Inhabitants of the northern part of the Netherlands have successfully fought the sea since the Middle Ages.