Question

How does granite differ from gabbro in coloring and

silica content?
A. Granite is lighter colored with higher silica
content.
B. Granite is darker colored with lower silica
content.
C. Granite is darker colored with higher silica
content.
D. Granite is lighter colored with lower silica
content.

Answer 1

Granite is lighter in color and has a higher silica content than gabbro due to different mineral compositions, with granite being rich in silica-containing quartz and feldspar.

Step-by-step explanation:

Granite and gabbro are both igneous rocks, but they differ in both coloring and silica content. Granite typically has a lighter color with a high silica content, due to the abundant presence of minerals such as quartz and feldspar that are rich in silica. Gabbro, on the other hand, tends to be darker in color and has a lower silica content, as it is composed of more mafic minerals like pyroxene and olivine that contain higher amounts of iron and magnesium. Therefore, the correct answer to how granite differs from gabbro in coloring and silica content is: A. Granite is lighter colored with higher silica content.

Answer 2

Step-by-step explanation:

Igneous rocks are formed by the crystallisation of a magma. The difference between granites and basalts is in silica content and their rates of cooling. A basalt is about 53% SiO2, whereas granite is 73%. Intrusive, slowly cooled inside the crust.