{"version":"1.0","type":"rich","title":"activity6_question9","description":"A bubble chart compares the population and GDP of 25 major U.S. cities, with bubble size representing city area and color intensity encoding GDP. The visualization uses D3.js v7 to load data from a CSV file and render SVG circles. Interactive tooltips appear on mouseover, showing each city's population and GDP. The chart includes labeled axes, a legend for area, and uses `d3.scaleLinear`, `d3.scaleSequential`, and `d3.interpolateBlues` for encoding.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/62ebcc7f5bd341459790a5b1fff3e78c?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}