1. A crescent-shaped sand dune; the horns of the crescent point downward?

2. Those products of an urban unit that are exported outside the city itself, earning income for the community?

3. A surveyor's mark for indicating the position and elevation of some stationary object; used as a reference point in surveying and mapping?

4. A small, flat-topped, isolated hill with steep sides, common in dry climate regions?

5. The plotting of a boundary line on maps or aerial photographs?

6. The ratio of the number of live births during one year to the total population?

7. The total assemblage of living orgasms in a single major ecological region?

8. Living matter, plant, and animal, in any form?

9. A general agreement between two states about the allocation of territory between them?

10 A heavy snowstorm accompanied by high winds?