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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
Describe the process that leads to exfoliation.
Distinguish between the following:
Acid Igneous Rocks and Basic Igneous Rocks.
Give one word for the following.
The upper part of lithosphere, which is rich in silica and aluminium.
Give one word for the following.
The core of the earth occupied by rock in iron and nickel.
Give one term for the following statement:
Sheet like body of igneous rock.
This is the storehouse of rocks.
The oldest sedimentary rocks of the world have been identified in ______.
Match the following.
| A. | Granite | 1. | Bed rock |
| 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.
