| A | B |
|---|
| Polder | a new piece of land reclaimed from the sea |
| population density | an average number of people living in a given area |
| peninsula | land area nearly surrounded by water |
| plateau | a large mostly flat area that rises above the surrounding land |
| tributary | a river or stream that flows into a larger river |
| navigable | wide enough and deep enough for ships to travel through |
| Eurasia | The landmass that includes the European and Asian continents |
| Ural Mountains | A mountain system in northern Eurasia forming part of the border between Europe and Asia |
| Alps | A mountain system |
| Siberia | A resource-rich region of Russia |
| rain shadow | an area on the sheltered side of a mountain that receives little rainfall |
| prarie | an area of grassland |
| tundra | a region where temperaures are always cool and where only certain plants, such a low grasses grow |
| permafrost | soil that is permanetly frozen |
| taiga | an enormous Rusian forest, covering more than three million acres |
| steppe | a mostlyy treeless plain; in Russia the steppes are grasslands of fertile soil suitable for farming |
| loess | a brownish-yellow fertile soil |
| hydroelectric power | the power generated by watr-driven turbines |
| fossil fuel | any one of several nonrenewable resources such as coal, oil, or natural gas, created from the remains of plants and animals |
| reserves | the available supplies of somethin, such as oil or coal |
