Question

question 1
2 pts
which of the following is a false statement?
decompression melting at divergent plate boundaries produces mafic magma in the asthenosphere.
continental extension typically produces mafic magmas in the asthenosphere.
assimilation of country rock requires heat - transfer melting in the crust.
flux melting of subducting lithosphere produces intermediate magma in the mantle wedge.
question 2
2 pts
plagioclase and olivine are examples of which mineral class?
silicates
carbonates
oxides
sulfates

Explanation:

• For Question 1: Continental extension in the asthenosphere typically produces felsic - not mafic - magmas. Decompression melting at divergent boundaries makes mafic magma in the asthenosphere. Assimilation of country rock needs heat - transfer melting in the crust. Flux melting of subducting lithosphere forms intermediate magma in the mantle wedge.
• For Question 2: Plagioclase and olivine are common silicate minerals. Silicates are minerals that contain silicon and oxygen, and these two are well - known examples in this class.

Answer:

Question 1: Continental extension typically produces mafic magmas in the asthenosphere.
Question 2: Silicates