Question

As temperature decreases, plagioclase that crystallizes from magma?

1) becomes richer in calcium
2) becomes richer in iron
3) becomes richer in magnesium
4) becomes richer in potassium
5) becomes richer in sodium

Answer 1

As temperature decreases, plagioclase that crystallizes from magma becomes richer in sodium.

Step-by-step explanation:

As temperature decreases, plagioclase that crystallizes from magma becomes richer in sodium(5). Plagioclase is a group of feldspar minerals that can have different chemical compositions. The proportion of sodium in plagioclase increases as the temperature decreases during the cooling process. This happens because sodium is more compatible with the crystal structure of plagioclase at lower temperatures.