What's exactly the 4 dimension (4d)?

Time is bounded up in the concept of Space. One without the other cannot be. Time is, in the Theory of Strings, the 4th dimension.

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.

Imma say go with a (: