1. The process by which organic waste is decomposed in an oxygen-free environment to produce methane gas?

2. A boundary line established before the area in question is well populated?

3. Underground porous and permeable rock that is capable of holding groundwater, especially rock that supplies economically significant quanities of water to wells and springs?

4. One of the four traditions of geography, that of regional geography?

5. The material manifestations of culture, including tools, housing, systems of land use, clothing, and the like?

6. The social process of merging into a composite culture, losing separate rthnic or social identity and becoming culturally homogenized?

7. In human geography, the concept that multethnic societies become a merger of the culture traits of their member groups?

8. The sediment carried by a stream and deposited in a floodplain or delta?

9. A fan-shaped accumulation of alluvium deposited by a stream at the base of a hill or mountain?

10. The weight of the atmoshere as measured at a point on the earth's surface?