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| Worsening economic conditions in the countryside, including rising unemployment and growing poverty. Rural decline drives migration to cities. |
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| The unequal distribution of wealth or resources in a geaographic area, so that some places are richer than others. |
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| The overall level of comfort and well being of a group or a country. People in developed countries have a higher standard of living than people in developing countries. |
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| The movement of people from rural to urban areas, resulting in the growth of urban areas. |
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| The movement of people from rural to urban areas, resulting in the growth of urban areas. |
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| A change in the way of life to suit new conditions. |
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| Natives of an area who have been conquered or dominated by others who came later. Native American tribes, such as the Cherokee or Navajo, are indigenous peoples. |
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| Farming carried out mainly to provide food for farm families, with little surplus for sale to others. |
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| Customs and ways of life handed down from ancestors. |
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| A warm ocean current that flows off the west coast of South America every few years. An El Nino event changes weather patterns around the world. it may also cause extreme weather in some regions. |
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| Severe or unusual weather conditions, such as hurricanes, tornadoes, and blizzards. |
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| The scientific study of climate and weather patterns. |
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| Great distruction or loss of life caused by natural forces rather than by human actions. |
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| A severe storm with high winds that spiral around a calm center. Depending on where they form, tropical cyclones are called hurricanes, typhoons, or cyclones. |
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| The variety of plants and animals living in one area. The term can also mean the great variety of all living things on Earth. |
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| The process by which carbon and oxygen cycle among plants, people and animals, and the environment. |
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| Removing or clearing away the trees from a forest. Deforestation is often used to clear land for farming or ranchng. |
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| Using resources in ways which that meet the needs of peole today without hurting the ability of future generations to meet their own needs. This means finding ways to use resources without using them up. |
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| A broadleaf evergreen forest found around in wet or hot regions near the equator. |
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| The division of land into zones based on elevation, which in turn helps determine climate and vegetation. |
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| The lowest elevation on mountains where snow remains year round. |
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| The creation of flat areas on moutain slopes for the purpose of farming. |
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| The highest elevation where trees grow on a mountain. |
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| The trading of crops between lowland and highland areas. |
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