Lava flows

Nature 
http://www.geo.mtu.edu/volcanoes/hazards/primer/lava.html.
Incidence 
The biggest hazard of lava flows is that they destroy property. In the late 1980's, the town of Kalapana in Hawai'i was destroyed by lava flows. Lava flows buried cars and burnt homes, buildings, and vegetation. Electric power, water, and communications were cut off from the community.
Broader 
Aggravates 
Type 
(E) Emanations of other problems