Warm front, cold front

Cold and warm fronts are formed where bodies of cold and warm air meet.

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The water cycle (basic)

Water on Earth is in a continuous state of change. The water cycle includes processes...


The rise and drop of sea levels caused by the gravitational force of the Moon.


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

Nitrogen cycle

Atmospherical nitrogen is bound by bacteria and used by living organisms in the form of...

Oxygen cycle

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

Types of soil (soil profiles)

This animation demonstrates different types of soil.

Polluting natural waters

Water is one of our key natural resources; we must protect it vigorously.

Mediterranean climate

It is characterised by dry, hot summers and mild winters.

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