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Plate tectonics
The Earth's crust and upper part of the mantle are
broken into large pieces called tectonic plates. These
are constantly moving at a few centimetres each year.
Although this doesn't sound like very much, over
millions of years the movement allows whole continents
to shift thousands of kilometres…

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Alfred Wegener (1880 - 1930)
The theory of plate tectonics and continental drift
were proposed at the beginning of the last century by a
German scientist, Alfred Wegener. Before his time it
was believed that the planet's features, such as
mountains, were caused by the crust shrinking as the


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