What was one of the goals of Jacob Riis's book

Riis' goal was to bring to light the conditions of the poor living in the tenements and slums of New York City.

Explanation:

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thomas jefferson is the answer

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.