Mid-latitude cyclone and anticyclone

Cyclones are large areas of circulating air with clouds and precipitation being formed in its centre.

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The soil

Soil is the loose, uppermost, fertile layer of the Earth’s crust.


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

Milky Way

The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion...

How lakes disappear

On a geological time scale lakes are short-lived.

Climate zones

The Earth is divided into geographical and climatic zones, which result in the zonation of...


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


It is a sedimentary rock with high calcium carbonate content.

Mediterranean climate

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

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