Different kinds of maps are created for different purposes. To navigate from one place to another, one would prefer a physical (geographic) map, but to locate a country, one would need a political map and a world map is for the world. . Further refinements include road maps, topographic maps, nautical and aeronautical charts, each of which represent more physical details.. Thematic maps can be used to display distribution of various measurements, such as people, oil, cellphone coverage, etc.
This is a frame story. A frame story is a story within a story.
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The conclusion that can be best be drawn from the influence of these books would be "(1) Authors often increase public awareness of <span>significant issues" especially the last. </span>