Question

Which of the following is/are incorrect statement(s)?
A. Metamorphic rocks are formed by the transformation of igneous or sedimentary rocks into different kinds of rocks under low temperature but high pressure.
B. Slate is formed by the metamorphosis of limestone.
C. Marble is formed by the metamorphosis of granite.
D. Gneiss is a dark grey shiny rock made by metamorphism of shale. Used to make slates and blackboards.
E. All are correct.

Answer 1

Hint: These rocks are found in the Earth’s crust. Metamorphic rocks are produced from high temperature and pressure in the Earth’s crust. Slate is formed by low temperature and pressure. Marble refers to metamorphosed limestone. Gneiss displays foliation, composed of different minerals.

Complete answer:
On Earth, rocks are formed as igneous, sedimentary, or metamorphic rocks. Metamorphic rocks are produced from high temperature and pressure that transforms the original rock into a new rock. This original rock can be sedimentary, igneous, or even another metamorphic rock. $12\mathrm{\%}$ of the Earth’s crust is covered by metamorphic rocks. The word metamorphic comes from a Greek word that means ‘to change form’. Metamorphic rocks are harder than sedimentary rocks and igneous rocks. These rocks are from the roots of many mountain chains. Metamorphic rocks are divided into two: Foliated and Nonfoliated metamorphic rocks. The study of metamorphic rocks gives information about the temperatures and pressures that occur at the depths of Earth’s crust.
Slate is a fine-grained, homogenous metamorphic rock that can be split into thin sheets. Slate is made by low-grade metamorphism, caused by low temperatures and pressures. The word slate is used for different kinds of objects that are made from slate rock such as writing slate and blackboard. Slate is a perfect electrical insulator and fireproof.
A marble is made up of a metamorphosis of dolomite or limestone. It consists of calcium carbonate. Marble has many color variances and has different sizes. Marble is harder than its original rock. Only after polishing, marble is used as building materials. Marbles are formed in large deposits with thickness.
Gneiss is a type of metamorphic rock. Gneiss is subjected to more heat and pressure. Gneiss has the same composition as that of granite. The word Gneiss is derived from a German word that means bright or sparkling. Gneiss is also formed from sedimentary rock such as sandstone or shale. It is used as a building stone.
So, the correct answer is Option E.

Note: Metamorphic rocks are found in mountainous regions and it is a good indicator that mountains were present in the places that are now low hills. These rocks are also formed when rock is heated by the intrusion magma from the Earth's interior. Slate has thermal stability and chemical inertness.