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प्रश्न
Why is coal hard and chunky?
टीपा लिहा
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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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Rock and it's Types
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संबंधित प्रश्न
How are igneous rocks classified on the basis of their chemical composition?
How are sedimentary rocks formed?
Differentiate between Rock and Mineral
Classify the following rock: Peat
Classify the following rock: Quartzite
Give one word for the following.
Stratified rock formed organically but from vegetative matter-swamps and forests.
An aggregate of minerals on the Earth’s Crust is called ______.
Parent Rock is converted to loose Rock by ______.
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 |
Match the following.
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
