| A | B |
|---|
| any form of water that falls to Earth | precipitation |
| the process in which a gas changes into a liquid | condensation |
| the continuous transfer of carbon between the atmosphere and living things | carbon cycle |
| water in its gas state | water vapor |
| the continuous movement of water between Earth's surface and the air | water cycle |
| the transfer of nitrogen between the atmosphere and soil, plants, and animals | nitrogen cycle |
| the process in which a liquid changes into a gas | evaporation |
| a forest biome with many kinds of trees that lose their leaves each autumn | deciduous forest |
| one of Earth's large ecosystems, with its climate, soil, plants, and animals | biome |
| a hot, humid biome near the equator, with much rainfall and a wide variety of life | tropical rain forest |
| a cold, treeless biome of the far north, marked by spongy topsoil | tundra |
| most lakes, streams, rivers, and ponds | freshwater ecosystems |
| a sandy or rocky biome, with little precipitation and little plant life | desert |
| a cool, forest biome of conifers in the upper Northern Hemisphere | taiga |
| have tides, an upper region with many fish and whales, and a dark bottom | saltwater ecosystems |
| the first species living in an area | pioneer species |
| the gradual replacement of one community by another | ecological succession |
| ecological succession in a place where a community already exists | secondary succession |
| the first community in an area | pioneer community |
| ecological succession that happens where there are few, if any, living things | primary succession |
| the final stage of succession in an area, unless a major change happens | climax community |
