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प्रश्न
Why is coal hard and chunky?
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उत्तर
Coal is a combustible sedimentary rock occurring in rock strata in layers or veins called coal beds. Because of pressure and elevated temperature the carbon becomes hard and chunky.
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संबंधित प्रश्न
Classify the following rocks by selecting the correct option given below:
Gneiss
Give one difference between Extrusive igneous and Intrusive igneous rocks.
Distinguish between Regional and Contact metamorphism.
Classify the following rock: Slate
Give one word for the following.
The outer layer of the earth.
Give reasons for the following
Man’s habitat is the biosphere and not the lithosphere in the true sense.
Igneous rocks are called primary rocks.
Kola sample title is located in ______.
Match the following:
| Group 'A' | Group 'B' | ||
| A. | Granite | 1. | Bedrock |
| B. | Soil layer | 2. | Plutonic rock |
| C. | Barren island | 3. | Strip farming |
| D. | Soil conservation | 4. | Active Volcano |
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
