The supernova remnant Cassiopeia A (Cas A) is expanding in radius at a rate of about 0.5 arc second per year. Doppler shifts show that the velocity of expansion is about 5700 km/s. How far away is the nebula

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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.