Environmental Science

4. a path in which energy is transferred from one organism to another
6. land that is mainly covered with buildings and roads
10. the number and variety of species that live in an area
11. allowing more animals to graze in an area than it can support
14. the process of planting trees to re-establish forests that have been cut down
15. __________ gases absorb and radiate infrared radiation from the sun

1. an undesired change in the air, water, or soil that adversely affects humans and other organisms
2. a measure of how acidic or basic a substance is
3. all of the things that a society builds for public use
5. ________ pollutants are put directly into the air by human activity
7. widespread starvation caused by a shortage of food
8. chemicals used to kill insects, weeds and crop pests
9. the solid part of Earth that consists of rocks and soil
12. all of the organisms living in an area and their physical environment
13. a large region characterized by a specific type of climate, plants, and animals