| A | B |
|---|
| population density | the average number of people living in a square mile or a square kilometer |
| tributary | a river or stream that flows into a larger river |
| navigable | wide and deep enough for ships to travel long distances |
| arable | land that is able to be used for agriculture |
| 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 |
| fjord | a long, narrow, deep inlet of the sea located between steep cliffs |
| climate | the annual weather patterns of a place |
| Ural Mountains | located along Europe's eastern border, dividing Europe from Asia |
| Mediterranean Sea | borders the southern coast of Europe |
| peninsula | land surrounded by water on three sides |
| Strait of Gibraltar | narrow strait that separates Europe from Africa |
| Chunnel | a train tunnel that runs under the English Channel; it connects London, England to Paris, France |
