The African savannah

The largest contiguous savannah in the world is in Africa. It covers about one-third of the continent.

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Terms of physical geography

This animation demonstrates the most important relief features, surface waters and their...

El Niño

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


The last Ice Age ended about 13 thousand years ago.

Cloud formation, types of clouds

Evaporating surface water forms clouds of various shapes from which water falls back to the...


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

The process of physical and chemical weathering

Upon physical weathering the rock only falls into pieces, whereas during chemical weathering its...


The dissolution of limestone results in the development of karst formations.

Solar radiation

The Sun's rays travel through space without interruption, but once they reach the Earth's...

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