| A | B |
|---|
| calendar | a system for breaking time into units |
| chronology | the order in which events happen |
| globe | a round model of the earth |
| map | a flat drawing of the Earth's surface |
| landform | a natural feature on the Earth |
| relief | the ups and downs of the Earth's surface |
| elevation | the height of an area above sea level |
| ecosystem | a community of living beings and their surroundings |
| opportunity cost | the cost of passing up the second choice when making a decision |
| capital | human-made goods that people use to produce goods and services; also money |
| entrepreneur | a person who starts and runs a business |
| market economy | economic system in which buyers and sellers choose to do business with those who satisfy their needs and wants best |
| free enterprise system | economic system in which people are free to control and own the means of production |
| tariff | a tax on imports |
| naturalization | the legal process of becoming a citizen |
| due process | procedures the government must follow that are established by law |
| federal system | type of government in which power flows between state and local governments and the natural government |
| amendments | additions to the U.S. Constitution that help define the basic rights of all Americans because of birth or naturalization |
| democracy | a form of government in which all the citizens hold power to create the laws that govern |
| Bill of Rights | The first 10 amendments to the Constitution |
