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A geyser is a spring characterized by intermittent discharge of water and steam.
In the past, a number of geologists tried to explain why the outlines of continents seem to fit...
Waves play an important role in forming the coast.
Lightning is a sudden electrostatic discharge accompanied by a sound known as thunder.
Water on Earth is in a continuous state of change. The water cycle includes processes...
The decisive factor that determines the climate zones of mountains is the altitude above sea level.
This video presents the different stages of coal formation.
Mercury, Venus, Earth and Mars may have they formed in much the same way, but only the Earth is...