| A | B |
|---|
| extinct | whne a species dies out |
| habitat | place where a plant or animal lives |
| environment | surroundings |
| ecosystem | groups of plants and animals that depend on each other |
| front | two air masses with different temperature meet |
| ocean currents | large streams of surface seawater |
| weather | short-term chnages in air |
| climate | average weather conditions |
| prevailing winds | winds that blow in the same direction over land |
| steppes | semidry grasslands |
| savannas | areas of tall grasses and scattered trees |
| monsoons | seasonal winds that bring either wet or dry air |
| permafrost | permanently frozen layers of soil |
