crossword

2. a chemical or natural substance added to soil or land to increase its fertility
6. the variety of all living things and their interactions
7. the process of receiving or giving systematic instruction, especially at a school or university
9. the death of an infant before his or her first birthday
11. the loose surface material that covers most land
12. The composition of a population in terms of the proportions of individuals of different ages
14. the number of individuals in a particular area
15. the control of all those factors in the physical environment which may exercise a harmful effect on human beings' physical development, health and survival
16. the process of eroding or being eroded by wind, water, or other natural agents

1. meeting the needs of the present without compromising the ability of future generations to meet their own needs
3. the draining away of water from the surface of an area of land, a building or structure
4. growth whose rate becomes ever more rapid in proportion to the growing total number or size
5. a theory that countries tend to shift from high birth and death rates to lower birth and death rates as they become wealthier and more industrialized
8. the preparation of land for growing crops
10. the ratio between the number of live births in a year and the whole female population of childbearing age
13. prevention of wasteful use of a resource