It would be the O type spectral class due to it being blue.
When gneiss is melted, it crystallizes into igneous rock. The correct option among all the options given in the question is option "C". It is also a fact the gneiss does not melt all at once. During the phase of initial melting, gneiss turns into migmatite. The early part of the melted material tend to become granite. So it is a true fact that gneiss tends to convert to an igneous rock on melting.
There are three major compositional groups of igneous rocks, mafic, felsic, and intermediate.
Mafic
The mafic igneous rocks are rich in magnesium and iron, making them a portmaneau of magnesium and ferric. They tend to be with dark coloration, with biotite and olivine being one of those rocks.
Felsic
The feslic igneous rocks are rich in elements that are forming the feldspar and quartz. Their coloration is lighter, and they come in numerous colors, with the granite and quartz being one of them.
Intermediate
The intermediate igneous rocks are in a way transitional rocks between the mafic and the felsic ones. They have a mixture of both mafic and felsic minerlas. Their coloration varies, and the andesite and dacite are some of them.
Answer:
the answer is choice d the last choice
In 1788, James Hutton discovered Siccar Point. It is by far the most spectacular of several unconformities that he discovered in Scotland, and very important in helping Hutton to explain his ideas about the processes of the Earth.
