| A | B |
|---|
| polders | new land created where sea used to be |
| population density | the average number of people living in an area |
| peninsula | a body of land nearly surrounded by water |
| plateaus | a large, raised area of mostly level land |
| tributary | a river or stream that flows into a larger river |
| navigable | clear enough for ships to travel through |
| rain shadow | an area on the dry, sheltered side of a mountain that recieves little rain |
| tundra | a treeless plain where mosses and short grasses grow |
| permafrost | soil that is frozen for most of the year (9 months, other three it is onle the top soil that thawn out) |
| prairie | an area of grassland |
| taiga | the largest forest in the world |
| steppes | a mostly treeless plain; in Russia the steppes are grasslands of fertile soil suitable for farming |
| loess | a type of rich soil found on the North European Pain |
| hydroelectric power | the power generated by water driven turbines |
| fossil fuel | fuel developed by the remains of ancient plants and animals; includes coal, oil, and natural gas |
| reserves | the available supply of something |
