Waterfall

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

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Rivers and landforms

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This video presents the different stages of coal formation.

Mountain climate zones

The decisive factor that determines the climate zones of mountains is the altitude above sea level.

Folding (basic)

Lateral compressive forces cause rocks to form folds. This is how fold mountains are formed.

The Gregorian calendar

Developed nearly 500 years ago, it is a variant of the Julian calendar. Today it is the most...

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Wind, as an external force, plays an important role in shaping coastal areas and steppes.

Tide

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

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