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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
Fill in the blank
Granite is an example of intrusive ________ rocks.
What are the causes of metamorphism?
State the properties of metamorphic rocks.
Give reasons for the following
Extrusive rocks generally have small crystals.
Give reasons for the following
Rocks are of great economic significance.
Chemical sedimentary rocks are found in the beds of reservoirs.
What are fossils?
Sedimentary rocks are called stratified rocks.
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 |
