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The Earth is divided into geographical and climatic zones, which result in the zonation...
On a geological time scale lakes are short-lived.
A Föld legbővizűbb folyama, az Amazonas és vízgyűjtő területének
This video presents the different stages of coal formation.
A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial...
Wind, as an external force, plays an important role in shaping deserts.
Physical properties, as well as the flora and fauna of the ocean change with depth.
Waterfalls form where the river flows over a steep precipice in its course.