| A | B |
|---|
| canopy | leafy roof formed by tall trees in a rainforest |
| understory | second layer of shorter trees and vines in a rainforest |
| desert | receives less than 25 centimeters of precipitation a year |
| grassland | biome with 25-75 cm of rain a year, populated by grass and nonwoody plants |
| savanna | grasslands located closer to the equator |
| tundra | extremely cold, dry land biome |
| permafrost | soil that is frozen all year |
| estuary | fresh and salt water mix, calm water |
| intertidal zone | salt water, pounding waves |
| neritic zone | region of shallow ocean water over the continental shelf |
