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प्रश्न
What are metamorphic rocks?
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उत्तर
Metamorphic rocks are those rocks that are formed by the metamorphism of pre-existing rocks due to high temperature or pressure or both. Igneous and sedimentary rocks completely change over long periods of time because of movements in the earth’s crust and volcanic or mountain-building activity.
The transformation of rocks due to high temperature is called thermal metamorphism. Alteration of parent rock due to the pressure exerted on rocks from the earth’s movements is called dynamic metamorphism.
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संबंधित प्रश्न
What is crust?
Classify the following rocks by selecting the correct option given below:
sandstone
How are sedimentary rocks formed?
Name any three elements of the earth’s crust.
Distinguish between Thermal metamorphism and Dynamic metamorphism.
Fill in the blanks
______ is formed, when the angular and coarse grains of some durable minerals are cemented together.
Fill in the blank below:
______are intrusions of igneous rock that are vertical in shape
Lava comes out from a volcano.
| A | B | ||
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
