Final answer:
The correct order of rocks from lowest to highest concentration of ferromagnesian silicates is Felsic, intermediate, mafic, ultramafic.
Step-by-step explanation:
The list that correctly orders rocks from the lowest to the highest concentration of ferromagnesian silicates is Felsic, intermediate, mafic, ultramafic. Felsic rocks, such as granite or rhyolite, contain a high percentage of silica and are rich in minerals like quartz and potassium feldspar, which are light in color. Intermediate rocks have a balance of light and dark minerals. Mafic rocks, like gabbro or basalt, are rich in magnesium and iron, containing minerals like pyroxene and olivine, which tend to be darker. Lastly, ultramafic rocks have the highest concentration of dark ferromagnesian minerals like olivine, and thus contain the most iron and magnesium.