Hi,

I have a couple of questions that I'm trying to work with but am getting very hung up on for whatever reason, I'm hoping someone can enlighten me. :)

Q1 If the original source magma is basaltic from the upper mantle how might acid melts form to produce granites etc?

Q2 Explain how the cooling rate of a magma may cause variation in the chemical composition of the rocks which are formed?

I think Q2 may refer to Bowen's Reaction Series but I'm not sure if it is, or how to put it into words!

Thanks
John