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When the temperature of the cooling air reaches dew point condensation occurs because air is...
Waterfalls form where the river flows over a steep precipice in its course.
Tsunami waves are very high waves of immense destructive power.
This video presents the different stages of coal formation.
One third of the continents is covered with desert. Today, desertification is a growing problem.
The dissolution of limestone results in the development of karst formations.
Icebergs are small or large blocks of frozen freshwater floating in the sea.
Mercury, Venus, Earth and Mars may have they formed in much the same way, but only the Earth is...