The map directly below shows the Western Hemisphere and four cities. The map below that shows cities where various friends have moved over the years. Both were created using the D3.js library to show the the baselayer and cities layer. Both layers were GeoJSON data.
Q2: d3 knew to put the image into the body of the page because of the line of code: "var svg = d3.select("#body").
Q3: A value of 90 was chosen because the projection would center on the western hemisphere.
Q4:If we wanted to underline the labels we would have to add "text-decoration: underline;" to the place-label section in the Header where we declare the font color.