| A | B |
|---|
| ecology | The study of how living things interact with each other and their environment |
| ecosystem | All living and nonliving things that interact in an area. |
| emigration | Leaving a population. |
| emissions | Particles and gases released into the air from a smokestack or motor vehicle. |
| endangered species | A species in danger of becoming extinct in the near future. |
| energy conservation | The practice of reducing energy use. |
| energy conservation | The practice of reducing energy use. |
| energy pyramid | A diagram that shows the amount of energy that moves from one feeding level to another in a food web. |
| erosion | The proces by which water, wind, or ice moves particles of rock or soil. |
| estimate | An approximation of a number based on reasonable assumptions. |
| estuary | A habitat in which the fresh water of a river meets the salt water of the ocean. |
| evaporation | The process by which molecules of a liquid absofb energy and change to the gas state. |
| exotic species | Species that are carried to a new location by people. |
| explosive | Capable of reacting very quikly when exposed to air or water or of exploding when dropped. |
| extinction | The disappearance of all members of a species from Earth. |
