Why is magnitude of average velocity not equal to speed?

 because the Average speed is total distance divided by total time, where as average velocity is total displacement by total time, and total displacement is less than or equal to total distance. The only time magnitude can be equal is if the object is travelling in a straight line, else displacement and distance covered will be different and the mag nitude would be different.

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.