Does the horizontal motion of the projectile depend on the vertical motion?

No, resolve in both directions separately 

Projectile motion follows a curved path created because of the gravity acting on the otherwise eternally traveling horizontal object, Can not necessarily say it depends on it, but it is a defining aspect of the projectile motion definition.

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.