Which of the following processes leads to the alteration of magma composition?

Differentiation is the correct process that leads to the alteration of magma composition. This geological process occurs when diverse minerals crystallize from a liquid magma at different temperatures and times, resulting in a separation of materials. As specific minerals form and settle out of the magma, the remaining liquid is altered in its composition. This leads to variations in the types of rocks produced from the same initial magma source. Differentiation can occur through mechanisms such as gravitational settling of crystals (in which denser crystals sink to the bottom) or the interaction of magma with surrounding rocks.

Cooling, while an essential part of the overall process of magma solidifying, does not inherently change the composition of the magma. It primarily controls the rate at which the magma solidifies and can influence the size of crystals that form but doesn't alter the chemical makeup of the remaining liquid itself.

Solidification refers to the transition of magma into solid rock, marking the final stage of crystallization. While it is a significant step in the rock formation process, it is not a process that actively alters the magma's initial composition.

Crystal growth is a phenomenon that occurs after crystallization has started, resulting in the development of larger crystals from the existing minerals within the magma. While it can modify the physical characteristics