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| A force thst divides people and countries. |
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| A force that unites people and countries. |
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| A group of countries that acts as a single market, without trade barriers between members countries. |
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| A form of international cooperation in which countries give up some control of their affairs as they work together to achieve shared gaols. |
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| The study of human poulations, including how they change due to births, deaths, aging, and migration |
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| The number of old and young dependents who don't work compared with the working-age population. the higher the ratio, the more young and old people the workers have to support. |
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| The average age hat a person in a given country can expect to live. Life expectancy varies from country to country. |
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| The total fertility rate needed for a population to replace itself. This number varies by country, but is about 2.1 in most developed countries. |
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| Total Fertility Rate (TFR) |
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| The average number of children a woman in a given population will have in her lifetime. This number varies by country. |
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| Rain that can damage the environment becuase it contains acid from factory smoke and car exhaust. Acid rain damages plants, fish, animals, and even buldings. |
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| 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. |
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| Pollution that starts in one country and crosses boundaries into other countries. Generally, transboundary pollution is carried by wind or water. |
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| A river andall the streams thart flow into it. The streams that flow into a river are known as tributaries. |
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| The gradual wearing away of Earth's surface by the action of wind, water,ice, and gravity. |
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| The creation and movement of glaciers. |
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| Natural forces that change the Earth's physical features, including forces that build up and wear down earth's surface. |
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| The movement of plates below the Earth's surface. |
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| The formation and eruption of volcanoes. |
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| A group of people in a country who share a unique culture and identity. |
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| A large group of people who share a common history and culture. Not all nations have their own governements or control a territory. Bt in common use, the word nation often means a country or nation state. |
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| Feelings of loyalty and pride toward one's nation or ethnic group. Nationalism sometimes includes the beleif that one's nation or group is better than all others. |
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| An independent state, or country, whose people mostly share a common identity. |
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| A political unit that controls a particular territory. |
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