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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
Rocks and minerals play a very important role in our lives.
Can you imagine modern life without minerals?
Classify the following rocks by selecting the correct option given below:
schist
What are known as metamorphic rocks?
What physical agents are involved in the sedimentary rocks?
How are chemically-formed sedimentary rocks formed? Give examples.
Give one word for the following.
The core of the earth occupied by rock in iron and nickel.
Give one word for the following.
The best example of chemically-formed sedimentary rock, which has been formed by the evaporation of water from solution containing minerals.
Give reasons for the following
Rocks are of great economic significance.
Match the following:
| 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 |
