class-02 demo

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Last edited Feb 18, 2017

Created on Feb 18, 2017

A map of Oklahoma displays earthquake epicenters as red points on a blank state background, with county borders outlined in gray. The visualization filters earthquake records by a magnitude threshold and projects them using `d3.geoAlbersUsa`. The code loads GeoJSON and TopoJSON data via `d3.json` and renders the geographic features with `d3.geoPath`.

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