Chernozem: rich, black topsoil, found in North European Plains, especially in Russia and the Ukraine.
Hydroelectric Power: electrical energy produced by falling water.
Permafrost: permanently frozen layer of soil beneath the surface of the ground.
Tundra: vast, treeless plains in cold northern climates, characterized by permafrost and small, low plants, such as mosses and shrubs.
Taiga: Russian term for the vast subarctic forest, mostly evergreens, that covers much of Russia and Siberia
Steppe: Wide grassy, plains of Eurasia, also, similar semiarid climate regions elsewhere.