Assertion: magma's silica content | /r/HasProperty | high
Facets:
Source sentences:
text: Generally speaking, magma has a high silica content – in most cases over 50 percent – and so silica can be said to form the base of magma.
text: This magma tends to be extremely viscous because of its high silica content, so it often does not attain the surface but cools and solidifies at depth.