1. A chemical used to kill plant and animal pests and disease organisms?

2. The thin film of air, water, and earth within which we live, including the atmoshere, surrounding and subsurface waters, and upper reaches of the earth's crust?

3. The actual marking of a boundary line on the ground; the final stage in boundary development?

4. The accumulation of a chemical in the fatty tissue of an orgasm and its concentration at progreeively higher levels in the food chain?

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

6. The combustable and/or fermentable material of plant or animal organ, such as woods or corcobs, that can be used as a source of energy?

7. The branch of geography that studies the distribution of plants and animals on the earth?

8. The number of species present in a given ecosystem?

9. Any wide indentation of the land. Larger than a cove but smaller than a gulf?

10. A heavy snowstorm accompanied by high winds?