1. Largest recognizable assemblage of animals and plants on the Earth?

2. BTu?

3. Saucer shaped depressions created by wind erosion?

4. Is a closed desert basin with no drainage outlet, surrounded by mountains?

5. Environment that is influenced by seawater with a salinity less than 35 parts per thousand?

6. High to mid-latitude biome dominated by coniferous forest?

7. Model that explains the origin of the various types of igneous rocks?

8. Increase in concentration of toxic fat-soluble chemicals in organisms at successively higher trophic levels of a grazing food chain or food web because of the consumption of organisms at lower trophic levels?

9. A unique region on the Earth that has distinct soils, landforms, watersheds, climates, native plants, and animals, and/or other particular natural characteristics?

10. Maximum rate that a population of a given species can increase in size when there are no limits on growth rate?