Maps are useful because maps tell you directions of places so without maps if you never knew where to go and you didn't have a compass then that is when a map does it job
A map is a representation or a drawing of the earth’s surface or a part of it drawn on a flat surface according to a scale.
We find that maps are useful to us for various purposes.
Maps can be used to show the physical features of the Earth (mountains, plains,oceans, rivers, etc.), the political divisions of the Earth (countries, states, cities,villages, etc.), and certain specific information (roads, rainfall, forests, industries,etc.)
It can be used for representing large areas like continents or countries (large scale maps), and also for representing a small area like a village or a town (small scale maps).
Source: class, knowledge.
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the continental divide is a ridge of high ground that runs irregularly north to south through the rockey mountain and separate eastward flowing from westward flowing streams
well a earthquake mile is split up into 60 min wch is split up into 60 sec so it will take about 30 to 60 min for it to cover 1 degree longitude. hope this helps a little bit.