| A | B |
|---|
| Applied Science | Study and activity that uses information provided by pure science to solve problems; examples are engineering and medicine. |
| Biosphere | The layer around the Earth in which life occurs naturally, extending from about 8 km above the Earth to the deepest part of the ocean, which is about 8 km deep. |
| Consumption Crisis | Situation in which natural resources are being used up, wasted, or polluted faster than they can be renewed, replaced, or cleaned up. |
| Developed Countries | Highly industrialized countries with high incomes and high standards of living. |
| Developing Countries | Less industrialized countries in which the average income and standard of living are low. |
| Ecology | The study of how living things interact with each other and with their nonliving environments. |
| Environment | The surrounding of an organism that affect its life and development. |
| Environmental Science | Study of how humans interact with the environment. |
| Experiment | Activity designed to test a hypothesis under controlled conditions. |
| Hypothesis | A testable explanation for a specific problem or question, based on what has already been learned. |
| Natural Resource | Any natural substance that humans use, such as sunlight, soil, water, plants, and animals. |
| Nonrenewable Resource | Resources that can be used up faster than they can be replenished naturally, such as coal, oil, and natural gas. |
| Population Crisis | Situation in which the number of people grows so quickly that a region cannot support them. |
| Pure Science | Study of activity that seek answers to questions about how the world works; examples are biology and physics. |
| Renewable Resource | Abundant natural resources that are continually produced, such as trees and sunlight. |
| Sustainable World | World in which human populations can continue to exist indefinitely with a high standard of living and health. |
