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population density the average number of people living in a square mile peninsula a land area nearly surrounded by water plateau a large raised area of mostly level land bordered on one or more sides by steep slops or cliffs tributary a river or stream that flows into a larger river navigable wide and deep enough for ships to travel through rain shadow the area on the dry, sheltered side of a mountain, which receives little rainfall steppes the grasslands of fertile soil suitable for farming in Russia tundra a cold, dry, treeless region covered with snow for most of the year permafrost a permanently frozen layer of ground below the top layer of soil loess a type of rich, dustlike soil hydroelectric power the power generated by water-driven turbines fossil fuel a source of energy that forms from the remains of ancient plants and animals