You obtain a sample of a crystallised lava and
find that it is felsic (contains quartz and feldspar). What does the
composition of the lava tell you about crystal fractionation processes in the
magma chamber?

Question

Answer

That
the magma chamber had almost no Fe and Mg when the eruption occurred, so a lot
of crystal fractionation had taken place.

Answer

That the magma chamber had almost no Fe and Mg
when the eruption occurred, so relatively little crystal fractionation had
taken place.

Answer

That
the magma chamber still had a lot of Fe and Mg when the eruption occurred, so
relatively little crystal fractionation had taken place.

Answer

That the magma chamber still had a lot of Fe and
Mg when the eruption occurred, so a lot of crystal fractionation had taken
place.

Crowdly

You obtain a sample of a crystallised lava and find that it is felsic (contains ...

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