d is the correct answer I belive. hope this helped>>
A star can be classified according to the following: main sequence, giants, and supergiants. On the other hand, the spectral class of a star is classified according to their temperature, absolute magnitude and solar luminosity.
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<span>Based on an existing classification, a star with an identified spectral class of M2 and a magnitude of +15 would be classified as a main sequence star.</span>
Acculturation is the answer
Answer:
1.Magma comes out of the rift valley.
2.Magma cools to rock and hardens.
3.Rock is pushed away as new rock is formed at MOR.
4.Oceanic crust and continental crust meet at the trench.
5.Oceanic crust bends down under the continental crust.
6.Gravity pulls rock towards mantle.
7.Rock melts to mantle.
