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प्रश्न
Distinguish between Regional and Contact metamorphism.
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उत्तर
Regional metamorphism When metamorphism of bed rocks takes place over a very large area, it is called Regional metamorphism. It is usually caused by the movement of the earth’s crust. Contact metamorphism when it takes place over a small area, it is called Local Metamorphism or Contact Metamorphism. It commonly occurs when hot magma comes in contact with other rocks.
संबंधित प्रश्न
State two characteristics of the mantle.
Explain the structure of the earth’s interior?
Explain this term associated with rocks: Metamorphism
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Accumulation takes place over long periods of time in seas, lakes and streams.
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What physical agents are involved in the sedimentary rocks?
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Igneous rocks, which contain a low percentage of silica.
Give one word for the following.
A sedimentary rock, which is composed of microscopically fine, soft and smooth particles.
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What are fossils?
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What is lava?
Match the following.
| Group A | Group B | ||
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
