This bubble chart shows how average population, area, and temperature correlate across multiple U.S. cities. Each circle’s x-position encodes population, y-position encodes area, radius encodes temperature, and color distinguishes cities. The visualization uses D3 v7 with SVG rendering, linear scales for axes and bubble size, and an ordinal color scale. Interactive tooltips appear on mouseover, while legend circles indicate the temperature-to-radius mapping. Data is loaded from a CSV file.