1. Factors that allow magma to push its way up- ward include temperature and (a) color
(b) density (c) crust (d) thickness.

Density

Explanation:

The factors that allows magma to push its way up includes temperature and density.

Temperature is the degree of hotness or coldness of a body

Density is the mass per unit volume.

 Temperature and density combines within the asthenosphere to create convective cells by which magma is force up.

i would think it's food chain