The soil

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

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El Niño

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

Altitudinal zonation

In mountainous areas the climate, soil properties, the flora and fauna change depending...

Tropical cyclones

Cyclones are large areas of swirling air with clouds and precipitation being formed inside.

Plate tectonics

Plate tectonics is a theory dealing with the movement of plates.


The last Ice Age ended about 13 thousand years ago.

The Tundra: a green-edged icy wasteland

Is the tundra region as cold and deserted as many people think?

Coal formation

This video presents the different stages of coal formation.


Waterfalls form where the river flows over a steep precipice in its course.

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