Suppose you found an igneous rock that had almost even amounts of silica, iron, and magnesium. How would you classify this rock? Why?

The rock will be andesitic because it has a composition between granitic and basaltic.

Explanation:

In igneous rock:

Origin of magma. andesitic magma are generated at confluent plate boundaries wherever the oceanic geosphere (the outer layer of the planet composed of the crust and higher mantle) is subducted in order that its edge is positioned below the sting of the continental plate or another oceanic plate. A gray, fine-grained igneous rock. igneous rock consists chiefly of sodium-rich oligoclase and one or a lot of mafic minerals like mica, hornblende, or mineral. It usually contains little, visible crystals (phenocrysts) of oligoclase, it's the fine-grained equivalent of igneous rock.

The rock will be andesitic because it has a composition between granitic and basaltic.