A pyroclastic flow erupts from:

Intrusive igneous rocks:

Which of the following acts to keep a rock solid (instead of melting)?

Which of the following is not true of mafic magma?

Isotopes of the same element vary in their number of:

An example of a silicate:

Which of the following feature is not associated with a convergent plate boundary?

 At transform plate boundaries, ________.  

An example of a sulfate mineral:

The atomic number of an atom is determined by the number of ___________ in its nucleus.