Question

Define texture. Enumerate the factors controlling texture of Sedimentary rocks.Distinguish between elastic and Non-elastic textyres.

Answer 1

Rock, in geology, naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is comprised and typically form recognizable and mappable volumes. Rocks are commonly divided into three major classes according to the processes that resulted in their formation. These classes are (1) igneous rocks, which have solidified from molten material called magma; (2) sedimentary rocks, those consisting of fragments derived from preexisting rocks or of materials precipitated from solutions; and (3) metamorphic rocks, which have been derived from either igneous or sedimentary rocks under conditions that caused changes in mineralogical composition, texture, and internal structure. These three classes, in turn, are subdivided into numerous groups and types on the basis of various factors, the most important of which are chemical, mineralogical, and textural attributes.

Answer 2

Texture. The texture of a rock is the size, shape, and arrangement of the grains (for sedimentary rocks) or crystals (for igneous and metamorphicrocks). ... The latter is the extent to which the bulk structure and composition are the same in all directions in the rock. Rocks have many different textures.



Key difference: The main difference betweena plastic body and an elastic body is based on individual their ability to regain their shape and size after an external force is applied to the bodies. ... Now, when the force is removed, the material depending on its properties may or may not return to its original shape.