How do gravitational differentiation (crystal settling) and assimilation bring about compositional changes in magma? Also, give evidence that these processes actually take place.

Magma is a hot liquid viscous Lava which under the earth refers to as Magma and outside the earth surface is called lava.
Differentiation it is a process by which magmar evolves to give rise the variety of Magma and its various rock type composition.
there are certain mechanism of Magma differentiation are given below:
a) Partial melting : a series of liquids produced by...