1. What is magnetism?
2. What is electromagnetism?

Magnetism is the force or ability of a magnet to attract or repel other magnetic substance encircled in its magnetic field or magnetic circumzone.Electromagnetism is the process of inducing E.M.F (ElectroMotive Force) in a material due to change in magnetic flux caused due to change in current across a magnet.

answer and explanation;

composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock while texture refers to the size and arrangement of the minerals or grains that make up a rock. both composition and texture can be used to classify rocks, such as igneous rocks. texture describes how the rock became solid or crystallized from liquid, melted rock. composition of a rock describes the minerals that make up a particular rock.