{"version":"1.0","type":"rich","title":"activity6_question9","description":"A bubble chart displays population and GDP for 25 US cities, with bubble size encoding land area. It loads CSV data via `d3.csv` and uses `d3.scaleLinear` for x/y axes and radius, plus `d3.scaleSequential` with `d3.interpolateBlues` for color. Interactive tooltips appear on mouseover, showing city details. SVG rendering includes axes, labels, and a legend for bubble sizes.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/a70cb3d365e645a8b8590ab79dd4ed88?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}