| A | B |
|---|
| rain forest | dense forest in tropical regions with heavy, year-round rain |
| savanna | tropical grasslands with scattered trees, usually with wet and dry seasons |
| marine west coast climate | coastal climate with mild winters and cool summers |
| Mediterranean climate | mild mid-latitude coastal climate with rainy winters and hot, dry summers |
| humid continental climate | climate in continental interiors, with cold winters and short, hot summers |
| humid subtropical climate | warm, mild, rainy mid-latitude climate |
| tundra | broad, dry, treeless plain in the high latitudes |
| permafrost | permanently frozen lower layers of soil in Arctic regions |
| elevation | height above sea level |
| timberline | elevation above which trees cannot grow |
| steppe | dry treeless grasslands, often found at the edges of deserts |
