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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:
basalt
Explain this term associated with rocks: Extrusive Igneous Rocks
State the types of rocks for the formation of which the following process is involved.
Solidification of magma on the surface of the earth.
Classify the following rock: Marble
Give one word for the following.
Igneous rocks, which contain a high percentage of silica.
Give one example of an area of: Igneous rocks
Distinguish between Intrusive and Extrusive Rocks
An aggregate of minerals on the Earth’s Crust is called ______.
Lava comes out from a volcano.
| A | B | ||
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
