Across
- 5. rain that can damage the environment because it contains acid from factory smoke and car exhaust. Acid rain can damage plants, fish, animals, and even buildings.
- 6. a large group of people who share a common history and culture. Not all nations have their own government or control a territory. Note that in common use, the word nation often means a country or nation-state.
- 7. natural forces that change Earth's physical features, including forces that build up and wear down Earth's surface
- 9. the movement of plates below Earth's surface
- 12. a group of people who share a unique culture and identity
- 13. the creation and movement of glaciers
- 14. an independent state, or country, whose people mostly share a common identity
Down
- 1. the formation and eruption of volcanoes
- 2. feelings of loyalty and pride toward one's nation or ethnic group. Nationalism sometimes includes the belief that one's nation or group is better than all others.
- 3. a political unit that controls a particular territory
- 4. a river and all the streams that flow into it. The streams that flow into a river are called tributaries.
- 8. pollution that starts in one country and crosses boundaries into other countries. Generally, transboundary pollution is carried by wind or water.
- 10. the gradual wearing away of Earth's surface by the action of wind, water, ice, and gravity
- 11. a form of energy that comes from nuclear reactions. Radiation has no smell or taste, but it can be very harmful to living things. Materials polluted with nuclear radiation are said to be radioactive.