Volcano heat melts roads

The picture below is of one of the roads in Yellowstone National Park melting as a result of a volcanic hotspot. It would make a great starter for a lesson on predicting volcanic activity or super volcanoes. Not only could you ask pupils about what they think is happening in the picture but also get them to imagine they are in charge of the park and what they would do as a result of this event, evacuate or simply repair the road? Why? It could lead into a good discussion on predicting tectonic hazards too.