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Water on Earth is in a continuous state of change. The water cycle includes processes...
Natural gas and petroleum are among the most important sources of energy and raw materials today.
A glacier is a large body of ice that forms from snow, and is in constant, slow motion.
Lateral compressive forces cause rocks to form folds. This is how fold mountains are formed.
An earthquake is one of the most devastating natural phenomena.
In the past, a number of geologists tried to explain why the outlines of continents seem to fit...
Above a certain altitude snow does not melt, not even in summer.
The dissolution of limestone results in the development of karst formations.