Question

question 46
2 pts
which of the following describes the formation of the oceanic lithospheric mantle?
sediment scraped from subducting oceanic lithosphere accumulates in the accretionary prism.
decompression melting of ultramafic asthenosphere produces mafic magma which cools to form mafic rocks.
flux melting in the asthenosphere produces magmas which cool at the base of the crust.
gradual cooling of the uppermost mantle beneath oceanic crust.
question 47
2 pts
a mineral is a -occurring, with a defined composition and a/an atomic structure.

Explanation:

For Question 46: The oceanic lithospheric mantle is formed by the decompression melting of ultramafic asthenosphere which produces mafic magma that cools to form mafic rocks. This is the correct process among the options.
For Question 47: A mineral is a naturally - occurring, inorganic solid with a defined chemical composition and an ordered atomic structure.

Answer:

Question 46: Decompression melting of ultramafic asthenosphere produces mafic magma which cools to form mafic rocks.
Question 47: naturally, inorganic, solid, chemical, ordered