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Above a certain altitude snow does not melt, not even in summer.
This animation demonstrates different types of volcanic eruptions
It is characterised by dry, hot summers and mild winters.
Plate tectonics is a theory dealing with the movement of plates.
When masses of cold and warm air meet, weather fronts develop.
A glacier is a large body of ice in constant, slow motion down a hillside.
A lightning is a sudden electrostatic discharge accompanied by a sound known as thunder.
Rivers play an important role in shaping the Earth's surface: they cause erosion as well as...