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| Earth-sun relationship | The position of the earth relative to the sun that helps to determine the time of day and night, seasons and time zones |
| Multiple-tier timeline | A timeline that utilizes two or more rows of events, with each row representing a different subject or perspective occurring during the period under study (e.g. timeline of the 19th century with separate rowsfor political, social, military and technologic |
| parliamentary democracy | A system of government in which executive leaders (usually a prime minister and a cabinet) are chosen by and responsible to the legislature (parliament), as well as being mambers of the legislature, as in Great Britian. |
| Political map | A portrayal on a flat surface of the political features of the Earth (e.g., international boundaries, capitals, political subdivisions). |
| Primary source | an account of an event by someone who was present at the event. |
| representative democracy (republic) | A democratic system of government in which the people exercise political control and participate through elected represnteatives responsible for promoting the common welfare |
| Territory | An area of land; the land waters under the jurisdiction of a state, nation or sovereign. |
