Across
- 3. the average number of children a woman in a given population will have in her lifetime
- 6. rain that can damage the environment because it contains acid created from chemicals in factory smoke and car exhaust.
- 7. the gradual wearing away of Earth's surface by the action of wind, water, ice, and gravity
- 8. an independent state, or country, whose people mostly share a common identity.
- 11. a river and all the streams that flow into it.
- 13. A wall separating East and West Berlin built by East Germany in 1961 to keep citizens from escaping to the West
- 16. feelings of loyalty and pride toward one's nation or ethnic group.
- 17. a force that divides people and countries
- 19. pictures or words painted or drawn on a wall, building, etc.
- 21. a large group of people who share a common history and culture
- 23. the formation and eruption of volcanoes
- 24. the movement of plates below Earth's surface
- 25. a force that unites people and countries
- 26. Natural forces that change Earth's physical features, including forces that build up and wear down Earth's surface
Down
- 1. a form of energy that comes from nuclear reactions.
- 2. a group of countries that acts as a single market, without trade barriers between member countries
- 4. a form of international cooperation in which countries give up some control of their affairs as they work together to achieve shared goals
- 5. pollution that starts in one country and crosses boundaries into other countries
- 9. the number of old and young dependents who don't work compared with the working-age population
- 10. the total fertility rate needed for a population to replace itself
- 12. various methods for communicating information
- 14. the average age that a person in a given population can expect to live to
- 15. the study of human populations, including how they change due to births, deaths, aging, and migration
- 18. the creation and movement of glaciers
- 20. a group of people in a country who share a unique culture and identity.
- 22. a political unit that controls a particular territory.
