Question:
What distinguishes metamorphic rocks from igneous and sedimentary rocks?
What distinguishes metamorphic rocks from igneous and sedimentary rocks?
Show Hint
- Metamorphic rocks are "changed form" rocks.
- They originate from pre-existing rocks (igneous, sedimentary, or other metamorphic rocks).
- The transformation occurs due to heat, pressure, and/or chemically active fluids, without complete melting.
- This changes the rock's mineralogy, texture, and chemical composition.
Updated On: May 29, 2025
- They are formed from the cooling of molten lava
- They are formed from the accumulation of sediments
- They are formed from the alteration of pre-existing rocks
- They are formed from the compression of organic remains
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
The three main types of rocks are igneous, sedimentary, and metamorphic, distinguished by their mode of formation:
- Igneous Rocks (related to option a): Formed from the cooling and solidification of molten rock material (magma below the surface or lava on the surface). Examples: Granite, Basalt.
- Sedimentary Rocks (related to option b): Formed from the accumulation, compaction, and cementation (lithification) of sediments (e.g., rock fragments, mineral grains, shells, organic remains). Examples: Sandstone, Shale, Limestone. The compression of organic remains (option d) can lead to specific types of sedimentary rocks like coal.
- Metamorphic Rocks (option c): Formed when pre-existing rocks (igneous, sedimentary, or even other metamorphic rocks) are changed (metamorphosed) by exposure to high temperatures, high pressures, chemically active fluids, or a combination of these, without melting completely. This alteration changes the rock's mineralogy, texture, and sometimes chemical composition. Examples: Marble (from limestone), Slate (from shale), Gneiss (from granite or other rocks).
Was this answer helpful?
0
0
Top TS PGECET Environmental Management Questions
- Which component of an ecosystem is responsible for the cycling of nutrients such as carbon, nitrogen and phosphorus?
- Energy flow is always unidirectional in an ecosystem because?
- Energy flow in an ecosystem is based on which laws?
- Photosynthesis converts solar energy into the chemical energy of a carbohydrate by?
- In a food chain, energy is transferred from one trophic level to another. What happens to the energy as it moves up the food chain?
View More Questions
Top TS PGECET Geology and Geospatial Technology Questions
- The radioactive isotope to find the Earth's age in radiometric dating of rocks is
- Which of the following is foliated sedimentary rock?
- If no crystallization takes place, then the rock is
- Which type of crust is formed when the older rocks are pushed above the younger rocks in earth's crust?
- Which landform is formed when the glacier cuts a U-shaped valley by abrasion?
View More Questions
Top TS PGECET Questions
- If \( P = \begin{pmatrix} 1 & 1 & 1 \\ 0 & 1 & 2 \\ 0 & 0 & 1 \end{pmatrix} \) is the modal matrix of \( A = \begin{pmatrix} 1 & 1 & 0 \\ 0 & 2 & 2 \\ 0 & 0 & 3 \end{pmatrix} \) then the sum of all the elements of \( P^{-1}AP \) is
- If the system of equations \( kx + y + z = k - 1 \), \( x + ky + z = k - 1 \), and \( x + y + kz = k - 1 \) has infinite solutions, then \( k \) is
- The value of the integral \( \int_C (2xy - x^2) \, dx + (x^2 + y^2) \, dy \) where \( C \) is the boundary of the region enclosed by \( y = x^2 \) and \( y^2 = x \), described in the positive sense, is
- Let \( f(x) = \log x \). The number \( C \) strictly between \( e^2 \) and \( e^3 \) such that its reciprocal is equal to \( \frac{f(e^3) - f(e^2)}{e^3 - e^2} \) is
- The solution of the differential equation \( (D^2 + 2)y = x^2 \) is
View More Questions