The logic of random assignment is to assign individual participants into different groups in an experiment through randomization so as to give every participants an equal chance of being assigned to any group, and reduce other characteristics that could influence the differences between the groups at the end of the experiment.
hot magma pushes itself to the surface at both divergent plate boundaries and convergent plate boundary . this magma come in contact with Rocks as it rise to the surface the magma is hot heating the rocks around it as the rocks heat they change and become metamorphic rock
