Volcanic activity

This animation demonstrates different types of volcanic eruptions.

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Folding (intermediate)

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

Limestone

It is a sedimentary rock with high calcium carbonate content.

Coal formation

This video presents the different stages of coal formation.

Fjord

A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial activity.

Eratosthenes

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

The World of the seas

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

How lakes disappear

On a geological time scale lakes are short-lived.

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