The subtropics

The subtropics are located between the tropical and temperate zones, between 23.5° and 40° latitude in both hemispheres.

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Tide

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

Terms of physical geography

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

How lakes disappear

On a geological time scale lakes are short-lived.

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...

Karstification

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

The desert

One third of the continents is covered with desert. Today, desertification is a growing problem.

Geyser

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

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