Here's why:

* Mafic magma is rich in magnesium (Mg) and iron (Fe). These elements create dark-colored minerals like pyroxene and olivine, which give the magma its characteristic dark hue.

* Felsic magma, on the other hand, is rich in silica (SiO2) and has a higher proportion of lighter-colored minerals like quartz and feldspar. This makes felsic magma appear light in color.

Let me know if you have any other questions!