Mineral Growth in Magmas at the Surface with Temperatures Around $\circ$

question 14

Multiple Choice

Mineral growth in magmas at the surface with temperatures around 1000 to 1200 ^$\circ$ C occurs in the following way:

• A)Iron and magnesium will link up with aluminum and the silicon-oxygen tetrahedron as magma temperature decreases to sequentially form four distinct and discontinuous families of minerals-olivine,pyroxene,amphibole,and biotite mica.
• B)Calcium will combine with aluminum and the silicon-oxygen tetrahedron to begin forming the plagioclase feldspar family,a continuous and gradational series of minerals.
• C)Both of these are correct.
• D)Neither of these is correct.

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