Across
- 5. A long-term trend of declining birth and death rates, resulting in a substantive change in the age distribution of a population.
- 6. A chemical or natural substance added to soil or land to increase its fertility.
- 10. The act of protecting Earth's natural resources for current and future generations.
- 12. The death of an infant before his or her first birthday.
- 15. The proportionate numbers of people in different age categories in a given population for a defined time.
- 16. The process of eroding or being eroded by wind, water, or other natural agents.
Down
- 1. The discipline that is concerned with methods of teaching and learning in schools or school-like environments.
- 2. A pattern of data that shows greater increases with passing time, creating the curve of an exponential function.
- 3. All the different kinds of life you'll find in one area.
- 4. The preparation of land for growing crops.
- 7. Able to be maintained at a certain rate or level.
- 8. Water flowing off the surface.
- 9. The upper layer of earth in which plants grow.
- 11. The process of keeping places free from dirt, infection, disease, etc.
- 13. number of humans around the world.
- 14. The number of children born alive to women of that age during the year as a proportion of the average annual population of women of the same age.