i need help to fill in the blank:
if lava has a high content of the mineral__________, it makes a volcano erupt explosively
http://www.sciencedaily.com/releases/2003/11/031128083028.htm
if lava has a high content of the mineral__________, it makes a volcano erupt explosively
http://www.sciencedaily.com/releases/2003/11/031128083028.htm