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| black topsoil, one of the world's most fertile soils |
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| separate the Northern European and West Siberia plains and used as the dividing line between Europe and Asia |
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| the combined continent of Europe and Asia |
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| a region that consists of the republics of Armenia, Azerbaijan, and Georgia; located between the Caucasus Mountains and the borders of Turkey and Iran |
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| a region that includes the republics of Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan |
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| a region of central and eastern Russia, stretching from the Ural mountains to the Pacific Ocean, known for its mineral resources and for being a place of political exile. |
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| a region's distance from the moderating influence of the sea |
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| a nearly continuous belt of evergreen coniferous forests across the Northern Hemisphere, in North America and Eurasia. |
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| rainfall not absorbed by soil, which can carry pesticides and fertilizers from fields into rivers, endangering the food chain |
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| links Moscow to the Pacific port of Vladivostok; built between 1891 and 1903 |
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