Magma composition <-- Silca plays a major part in determining the form of a volcano.
~Hope this helps!
A word root is the base part of a word (i.e., less any prefixes and suffixes).
To change the meaning of a word, a prefix can be added to the front of the word root, or a suffix can be added to the back. Quite often, a prefix and a suffix are added to a word root to change the meaning. (Prefixes and suffixes are known as affixes.)
