This histogram visualizes the frequency of earthquake magnitudes recorded in a CSV file, binning dates into monthly intervals. The chart uses D3 v4’s `d3.histogram()` and `d3.scaleTime()` to group data, with bars styled in steel blue via SVG. Axes are generated using `d3.axisBottom()` and `d3.axisLeft()`. The example demonstrates D3’s data-binding methods like `selectAll().data().enter().append()`, and the dataset is parsed with `d3.timeParse()`.