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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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buffalo buffalo
wrote...
12 years ago
Felsic minerals crystallize first

 2. Mafic minerals are light and float in most magma chambers

 3. Felsic crystals are heavy and sink in most magma chambers

 4. All crystals form at about the same time

 5. None of the above
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wrote...
#1
12 years ago
The order of crystallisation is determined by the composition of the magma, so felsic or mafic minerals could be first. Scratch one.

Mafic minerals are heavy, scratch two.

Felsic minerals are (relatively) light, scratch three.

Crystals form at different times - as the other minerals get removed from the melt the composition of the remaining liquid changes and the temperature falls, causing new minerals to start crystallising. Scratch four.

So 5 is correct.
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