1. Magma composition and viscosity are largely controlled by: A. Fe content B. M

Question

1. Magma composition and viscosity are largely controlled by:

            A. Fe content

            B. Magma chemistry

            C. Partial melting

            D. Plate tectonic setting

2. Low viscosity lavas are associated with?

            A. High Gas Content

            B. Mafic magmas

            C. Felsic magmas

            D. Explosive Volcanism

3. Continental Hotspots have higher viscosity and volatile content than oceanic hotspots.

            A. true

            B. false

4. Why are dissolved gases present in magma, but not lava?

            A. The gases condense to form liquids once magma hits the earth’s surface.

B. The gases escape once magma hits the earth’s surface or during decompression melting.

C. The gases combust once magma hits the earth’s surface or during decompression melting.

D. The gases crystalize once magma hits the earth’s surface.

5. Partial Melting of a Peridotite forms ______ magmas.

Explanation / Answer

1) C

2) A

3) A

4) B

5) Mafic

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