Climate zones

The Earth is divided into geographical and climatic zones, which result in the zonation of vegetation.

How does it work? - Record player

This animation demonstrates the mechanism and operation of record players.

Seafloor map

The boundaries of tectonic plates can be seen on the seafloor.

Neptune

Neptune is the outermost planet of the Solar System, the smallest of the giant planets

Tanning, skin cancer

The topmost layer of our skin is the epidermis, which contains melanocytes.

SM U-35 submarine (Germany, 1912)

Submarines had an important role in naval warfare as early as World War I.

Alkaline batteries

In alkaline batteries electric current is generated by electrochemical reactions

Nitric acid (HNO₃)

One of the oxoacids of nitrogen. A colourless compound with a pungent odour, a strong oxidant.

DC motor

DC motors consist of a permanent magnet and a coil within the magnet, with electric current flowing in it.

Thyroid gland

An important endocrine gland producing hormones that affect metabolism and the calcium balance of the body.

Sphere

A sphere is the set of points which are all within the same distance from a given point in space.

Paramecium caudatum

Common ciliated eucaryotic unicellular organisms widespread in freshwaters.

Cylindrical solids

This animation demonstrates various types of cylindrical solids as well as their lateral surfaces.

Golden Gate Bridge (San Francisco, 1937)

The suspension bridge that stretches above the strait between San Francisco Bay and the Pacific Ocean was opened in 1937.

Dissolution of hydrogen chloride (HCl) in water

The solution of hydrogen chloride in water is called hydrochloric acid.

Sewage treatment plant

Treated sewage water can be used in agriculture and industry.

Palaeolithic cave

The first dwellings in human history provide a lot of information about the lifestyle of our ancestors.

Neurons, nervous tissue

Neurons are cells specialised for transmitting electric signals.

The urinary system

The urinary system serves for the removal of harmful and useless materials from the body.

Evolution of the bicycle

The changing bicycle, at first mocked as a toy, is a true mirror of the technical development over the last three centuries.

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