1)Which of the following processes is most likely to significantly decrease the

Question

1)Which of the following processes is most likely to significantly decrease the silica content of a melt? Accimilation and/or, Decompression and/or ,Fractional Crystalization and/or Magmamixing, and/or Volatilisation?

2)What type of igneous exposure is seen at 65.77 N 16.80 W? Dike or Lave flow or Pluton, or Sill?

3)What type of igneous rock is it likely to be made of? Entrusive mafic igneous rocks OR Entrusive festic igneous rocks OR Intrusive mafic igneous rocks OR Intrusive festic ingeous rocks?

Explanation / Answer

answer 1 - magma mixing and assimilation

for example , if a granitic magma rich in silica is allowed mix with basaltic magma ( silica poor and calcium rich ) then dioritic/ andesitic magma, which is intermediate in composition, will results.

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