This visualization displays borehole data as an animated scatter/line plot, with a dropdown menu controlling which measurement (Depth or Temp) appears on the y-axis. The chart uses D3 v5 with SVG rendering, employing `scaleLinear`, `axisBottom`, and `axisLeft` for axes, plus a `line` generator for the connecting path. Circles transition over two seconds using `transition().delay()`, while the menu is built with a custom `dropdownMenu` module that binds `<select>` options to data columns.