| A | B |
|---|
| Acid rain | rain that is more acidic than normal |
| Carrying capacity | the largest population of any single species that an area can support |
| Deforestation | forest destruction that results from human activity |
| Direct harvesting | the destruction of any organism, or the removal of an organism from its habitat |
| Energy flow | the movement of energy through an ecosystem |
| Fossil fuel | a fuel, such as coal and gas, that comes from the remains of organisms that lived millions of years ago |
| Global warming | an increase in Earth’s average surface temperature caused by an increase in greenhouse gases |
| Industrialization | the process of converting an economy into one in which large-scale manufacturing is the primary economic base |
| Nonrenewable resource | any resource, such as fossil fuels and minerals, that cannot be replaced |
| Nuclear fuel | an energy source that results from splitting atoms |
| Ozone shield | the layer of ozone gas in the upper atmosphere that protects Earth from some of the sun’s radiation |
| Pollution | a harmful change in the chemical make-up of the soil, waters or air |
| Renewable resource | Earth’s resources, such as our food supply and solar energy, which, given time, can be replaced |
| Technology | all of the practical scientific knowledge that has been used to meet human needs |
| Trade-off | an exchange or agreement made to reach a compromise |
| Water cycle | the process by which water continuously moves from Earth’s surface to the atmosphere and back |
