Altitudinal zonation

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

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Taiga climate

Among the climate zones with the greatest extremes, the taiga only formed in the Northern...

The water cycle (intermediate)

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

Nitrogen cycle

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

Glaciation

The last Ice Age ended about 13 thousand years ago.

Aeolian landforms in deserts

Wind, as an external force, plays an important role in shaping deserts.

Atmospheric circulation

The difference between the temperature of the polar and equatorial zones causes...

Warm front, cold front

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

Rivers and landforms

Rivers play an important role in shaping the Earth's surface: they cause erosion as well...

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