the main crops in European plain is
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The traditional two-field system of crop rotation, in which half the agricultural land was left fallow each year to maintain soil fertility, gave way to the more sophisticated three-field system: in addition to the usual sowing of wheat, barley, or rye in the autumn, another part of the land was planted in oats or ...
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European Plain, one of the greatest uninterrupted expanses of plain on the Earth’s surface. It sweeps from the Pyrenees Mountains on the French-Spanish border across northern Europe to the Ural Mountains in Russia. In western Europe the plain is comparatively narrow, rarely exceeding 200 miles (320 kilometres) in width, but as it stretches eastward it broadens steadily until it reaches its greatest width in western Russia, where it extends more than 2,000 miles.
Because it covers so much territory, the plain gives Europe the lowest average elevation of any continent. The flatness of this enormous lowland, however, is broken by hills, particularly in the west.