The chemical composition of a magma is most likely indicated by A reddish color

Question

The chemical composition of a magma is most likely indicated by

A reddish color in a sedimentary rock usually indicates: a. oxidizing conditions b. reducing conditions c. an abundance of organic matter d. a lack of organic matter In Bowen's reaction series, as a magma gradually cools: a. calcium-rich plagioclase reacts continuously with the magma to become more sodium rich b. sodium-rich plagioclase reacts continuously with the magma to become more calcium rich c. biotite reacts discontinuously with the magma to form olivine d. muscovite reacts discontinuously with the magma to form quartz In order for metamorphism to occur, rocks must: a. melt b. partially melt c. be subjected to extremely high pressure d. none of the above Which of the following minerals is most stable at the earth's surface? a. hornblende b. quartz c. plagioclase d. olivine The magnetic field of the earth is most likely generated in the: a. lithosphere b. asthenosphere c. mantle d. core A zone of altered rocks around an intruded magma is called a: a. metamorphic aureole b. metamorphic gradient c. migmatite d. metamorphic grade Slate is a rock that was probably produced by metamorphism of: a. sandstone b. granite c. limestone d. shale

Explanation / Answer

28.. a. oxidising conditions explanations: due to oxidation of iron to iron oxides, there is a presence of reddish grains. 29.a. calcium rich plagiclase reacts continuosly with magma to become sodium rich. 30. c.rocks must be subjected to extremely high pressure. explanations:: rocks with high pressure and temperature undergo metamorphism.

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