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population density

the average number of people living in a square mile or a square kilometer


a land area nearly surrounded by water


a large raised area of mostly level land bordered on one or more sides by steep slopes or cliffs


a river or stream that flows into a larger river


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


the grasslands of fertile soil suitable for farming in Russia


a cold, dry, treeless region covered with snow for most of the year


a permanently frozen layer of ground below the top layer of soil


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

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