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Panpipes (or pan flutes) are composed of several pipes of gradually increasing length.
The guitar is a plucked string instrument available in various shapes.
The trumpet is a musical instrument with the highest register in the brass family.
Villages established in valleys usually consisted of houses built on long and narrow plots of land.
Vertical forces can break up layers of rock into fault blocks, which then move vertically along the fracture planes.
This animation demonstrates the different nets of a cuboid and includes a game.
The Earth is composed of several spherical layers.
Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes is continuously changing during the year.
A crystalline substance, an extremely important material in the electronics industry (semiconductors, integrated circuits).
The system of circles of latitude and longitude on the globe enable every location on the Earth to be exactly specified.
This animation demonstrates instruments used to examine atmospheric phenomena.
Raw iron is produced from iron ore in iron smelters.
The reproductive system is a series of organs working together for the purpose of reproduction.
An amino acid containing sulphur, one of the amino acids that make up proteins.
