Two factors that result in a volcano at a plate boundary are..
I don't get what this question is asking.
It's asking what is a volcano? Why is it located at a plate boundary?
http://www.geology.sdsu.edu/how_volcanoes_work/Volcano_tectonic.html
I don't get what this question is asking.
http://www.geology.sdsu.edu/how_volcanoes_work/Volcano_tectonic.html