The World of the seas

Seas and oceans cover almost three-quarters of the Earth’s surface. 97.5% of the total hydrosphere is saltwater.

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The soil

Soil is the loose, uppermost, fertile layer of the Earth’s crust.

Formation of stratovolcanoes

Stratovolcanoes consist of layers of volcanic ash, debris and lava.

El Niño

Az El Niño jelensége szinte az egész Föld éghajlatára hatással van.

Atmospheric circulation

The difference between the temperature of the polar and equatorial zones causes...

Ozone layer

The ozone layer filters the Sun´s harmful UV radiation, therefore it is indispensable for...

The Gregorian calendar

Developed nearly 500 years ago, it is a variant of the Julian calendar. Today it is the most...


It is a sedimentary rock made up of loosely structured, rough grains of rock.


Rocks are a composed of minerals. These minerals can often be found in their pure forms.

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