The Gregorian calendar

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

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The formation of the Andes

Az Andok két kőzetlemez – egy óceáni és egy szárazföldi – ütközésénél jött létre.

Greenhouse effect

Human activity increases the greenhouse effect and leads to global warming.

Folding (advanced)

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

Folding (intermediate)

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

Carbon cycle

Carbon is bound in organic substances during photosynthesis, while during breathing, it...

Karst region (intermediate)

Karst formations include dolines and dripstones.

Faulting (basic)

Vertical forces can break up layers of rock into fault blocks, which then move vertically...

Afrika - The geological anatomy of a continent

Az afrikai kontinens földtani formálódása és földrajzi felosztása.

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