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प्रश्न
What are metamorphic rocks?
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उत्तर
Metamorphic rocks are those rocks which were formerly igneous or sedimentary rocks, but owing to extreme heat and pressure in the interior of the earth it has been changed or altered to such an extent that they are quite different from what they once were slate, which is in reality clay, and marble’ which is in reality lime stone. Other examples of metamorphic rocks are quartzite from sand stone, graphite from coal, gneiss from granite and Mica from Schist.
संबंधित प्रश्न
Write True or False. Rewrite the false statement correctly :
Sedimentary rocks are formed by the cooling and solidification of molten rock called magma
Classify the following rocks by selecting the correct option given below:
gypsum
With the help of your teacher, collect different types of rocks such as granite, sandstone, limestone, marble, slate, graphite, etc. and prepare a chart containing information about their colour, hardness, texture, and permeability.
Name any three elements of the earth’s crust.
Distinguish between the following:
Thermal and Dynamic Metamorphism.
What is metamorphism?
Classify the following rock: Loess
Classify the following rock: Basalt
Give one word for the following.
Igneous rocks, which contain a low percentage of silica.
Why are Sedimentary rocks called the Secondary rocks?
Give one term for the following statement:
Formed when mud layers compacted under great pressure composing 80% of this rock.
Give one term for the following statement:
Sheet like body of igneous rock.
The word Ignis means rock.
Explain about Petrology.
The oldest sedimentary rocks of the world have been identified in ______.
Minerals exist in nature ¡n the form of ______ or ______.
Why are crystalline rocks called so?
Statement (1) : Sedimentary rocks consist of many layers.
Statement (2) : Sedimentary rocks are formed by the sediments deposited at different points of time
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
Match the following.
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
