Terms : Hide Images
| 4400544740 | Acid rain | Rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water. | 0 | |
| 4400544741 | pH scale | scale with values from 0 to 14, used to measure the concentration of H+ ions in a solution; a pH of 0 to 7 is acidic, a pH of 7 is neutral, and a pH of 7 to 14 is basic | 1 | |
| 4400544742 | hydrocarbon | Compounds composed of only carbon and hydrogen | 2 | |
| 4400547306 | sulfur dioxide | A colorless, corrosive gas directly damaging to both plants and animals. | 3 | |
| 4400547307 | deforestation | The removal of trees faster than forests can replace themselves. | 4 | |
| 4400550328 | chlorofluorocarbon | group of chemical compounds used in refrigerators, air conditioners, foam packaging, and aerosol sprays that may enter the atmosphere and destroy ozone | 5 | |
| 4400550329 | sustainability | A set of policies or practices by which societies can ensure that the people of the future have the same access to resources and thus the same economic and environmental opportunities as people living today. | 6 | |
| 4400551897 | urbanization | An increase in the percentage and in the number of people living in urban settlements. | 7 | |
| 4400551898 | biosphere | Consists of all life on Earth and all parts of the Earth in which life exists, including land, water, and the atmosphere. | 8 | |
| 4400551899 | biome | A large region characterized by a specific type of climate and certain types of plant and animal communities | 9 | |
| 4400555009 | biodiversity | The amount of biological or living diversity per unit area. It includes the concepts of species diversity, habitat diversity and genetic diversity. | 10 | |
| 4400556044 | genetic variation | Differences among individuals in the composition of their genes or other DNA segments | 11 | |
| 4400556045 | ecosystem | A system formed by the interaction of a community of organisms with their physical environment | 12 | |
| 4400556046 | biotic | Describes living factors in the environment. | 13 | |
| 4400558934 | abiotic | A term that describes a nonliving factor in an ecosystem. | 14 |
