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Minerals And Rocks
Question
What are metamorphic rocks? Describe the types of metamorphic rock and how are they formed.
Solution
A metamorphic rock is a type of rock which has been changed by extreme heat and pressure.
The types of metamorphic rocks depend upon the original rocks that were subjected to metamorphism. Metamorphic rocks are classified into two major types:
(i)foliated rocks
(ii)non-foliated rocks
Formation of metamorphic rocks : These rocks are formed due to thermal metamorphism.
It is of two types :
(i)Contact metamorphism: In contact metamorphism the rocks come into the contact with hot magma and lava and the rock material is recrystallized under high pressure and temperature.
(ii)Regional metamorphism: In regional metamorphism, rocks under go recrystallization due to deformation caused by tectonic shearing together with high temperature or pressure or both.
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Some More Questions From Minerals And Rocks Chapter
On what does texture of rock depend?
Write the examples of igneous rocks.
What is a sedimentary rock ?
Write some main sedimentary rocks.
Which important minerals are found in metamorphic rocks?
State one example of hard rock and soft rock.
The process of physical and chemical changes affecting sediments during their conversion into solid rocks.
Structure in metamorphic rocks in which minerals are drawn out into long, thin pencil like objects all in parallel alignment.
The smooth planer surfaces of weakness along which minerals have pronounced tendency of split.
Few large crystals imbedded into material of smaller crystals.
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