Circle the correct answer for questions 1-3. 1. Rocks that form by cooling of mo
ID: 113280 • Letter: C
Question
Circle the correct answer for questions 1-3. 1. Rocks that form by cooling of molten magma are igneous rocks. These rocks have......... .extures. a. crystalline b. fragmental (clastic) c. rough d. aligned e. smooth 2. Rocks that form by weathering and breaking apart of other rocks are sedimentary rocks. These rocks a. crystalline b. fragmental (clastic) c. rough d. aligned e. smooth 3. Rocks that form by alteration of other rocks by undergoing elevated pressure and temperature are metamorphic rocks. These rocks have ay have...textures. a. crystalline b. fragmental (clastic) c. rough d. aligned e. smoothExplanation / Answer
1. Rocks that are formed by cooling of molten magma are igneous rocks. the rocks have crystalline textures. Crystalline textures are formed during cooling of magma. Crystalline textures are made of interlocking crystals with each other. Generally the texture is prominent in igneous rocks, but it can not be found in clastic sedimentary rocks. Interlocking texture is the identifying texture of igneous rocks.
2.Rocks that are formed by weathering and breaking apart of other rocks are sedimentary rocks. These rocks have fragmental (clastic) texture because it is characterized by broken, weathered, and irregular particles. It is formed by the physical transportation and deposition of sedimentary particles. The texture represents clastic rock. Clastic texture is a extural term used for rocks which are composed of fine materials or of sandy, conglomeratic and brecciated particles.
3. Rocks that form by alteration of other rocks by undergoing elevated pressure and temperature are metamorphic rocks. These rocks have may have aligned texture. Each layer of platy or flattened minerals are formed sheet-like planar structure known as aligned texture. It is formed due to shearing forces. Shearing force is a pressures which exert pressure in different sections of the rock in different directions, Another cause of aligned texture is due to differential pressure. Differential pressure is higher pressure from one direction than in others. For that reasons, the mineral layers are aligned parallel to the direction of the shear, or the layers may be perpendicular to the direction of higher pressure.