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If I were Miss Rowley, I would tell 6th Grade two advantages and disadvantages of the Mercator and Robinson projection by saying......
What is the Robinson projection has accurate land masses and accurate lines of latitude however, it is distorted around the edges and the lines of longitude are curved. The Mercator projection shows accurate size of oceans and can be used for sea navigation however, it is also distorted around the poles and does not have accurate land mass size.