Oxygen cycle

The oxygen cycle describes the movement of oxygen within its three main reservoirs.

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Snow line

Above a certain altitude snow does not melt, not even in summer.


Waves play an important role in forming the coast.

El Niño

A periodic climate pattern that occurs across the tropical Pacific Ocean every five years.


A geyser is a spring characterised by intermittent discharge of water and steam.

Monsoon wind system

In summer, monsoon winds bring heavy rainfall from the sea to the mainland.

Taiga climate

Among the climate zones with the greatest extremes, the taiga only formed in the Northern...


The circumference of the Earth has already been calculated in ancient Egypt. The calculations...

Karst region (basic)

Karst formations include dolines and dripstones.

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