The Gregorian calendar

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

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Cloud formation

When the temperature of the cooling air reaches dew point condensation occurs because air is...

El Niño

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

Topography of the Earth

The animation presents the largest mountains, plains, rivers, lakes and deserts of the Earth.

Factors of warming

The duration of solar radiation, the angle of the Sun's rays and the surface albedo all have an...

Folding (basic)

Lateral compressive forces cause rocks to form folds. This is how fold mountains are formed.

Karst region (intermediate)

Karst formations include dolines and dripstones.

Local winds

The most important types of local winds are the sea-land breeze, the mountain-valley...

Underground waters

Groundwater and aquifers are types of underground waters.

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