Why would a pencil appear to be bent if half of it was embedded in diamond and the other half embedded in glass?

Due to refraction. refraction is in which the fact of  light, radio waves, etc.,. also the measurment of your eye charchteristics. you can always research more:)

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.