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Date Range
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The home of information on almost anything. An earthquake is the shaking of the surface of the Earth, resulting from the sudden release of energy in the . Sea waves have great mobility, because of their great mobility, water particles easily come out of . On the beds of oceans and seas there are mountain chains, volcanoes, valleys and deep. A valley is a thin basin situated between the bases of mountains. Valleys are formed by erosion . Destruction of forests by man. How fast can a dog run? A Greyhound c.