Across
- 2. no living members of a once existing group
- 7. flat land in (sub)arctic regions
- 8. fine particles of soil
- 9. hurricanes with heavy rain and flooding
- 10. unfit for use; has dangerous atoms
- 11. a narrow strip of land connecting two larger land masses
- 12. river, puts sediments in bodies of water
- 13. very large plains
- 15. profitable
- 16. very dry with extreme high temperatures
- 19. variety of species in an ecosystem
Down
- 1. the study of past events, like human affairs
- 2. height above sea level
- 3. countryside; away from cities
- 4. possibility or promise
- 5. the way thoughts and feelings are passed on
- 6. large masses of ice and packed snow
- 14. permanently frozen ground
- 17. closeness
- 18. a group of places with common traits