# On a Map What Does a Blue Line Usually Represent?

The blue line on a map usually represents fresh water bodies or oceans. in addition, blue line on political maps often represents water. For instance in special maps referred to as choropleth blue normally represents states that voted for democrats.
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 Blue lines on a map represent a river, last, stream http://www.chacha.com/question/what-does-the-symbo...
 I assume you are talking about a political map. In that case it would be donkey or Democrat. http://wiki.answers.com/Q/What_kins_of_animals_usu...
 I'm guessing by blue you mean water, so aqautic animals, fish etc, if its by climate, blue means cold so polar bears, seals, all those cold animals hope that helps http://answers.yahoo.com/question/index?qid=200611...
 The different kinds of lines and shapes in Map View are visual clues, and each has a specific meaning. See the Path Analysis online help for detailed information about interpreting http://www.cisco.com/en/US/docs/net_mgmt/ciscowork...
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If you are looking for the angle between a line and another, then it is usually represented by Ө (theta). If you're looking for the gradient of a line, use m = rise/run or m = y 2 - y 1 / x 2 - x 1 , where m is the gradient, (x 1 ,y 1 ) and (x 2 ,y 2 ...