Advertisements
Advertisements
प्रश्न
Why is coal hard and chunky?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Write True or False. Rewrite the false statement correctly :
Sedimentary rocks are formed by the cooling and solidification of molten rock called magma
How are igneous rocks formed?
Explain the formation of sedimentary rocks on the basis of agents of formation.
Classify the following rock: Limestone
Give one word for the following.
The outer layer of the earth.
Give reasons for the following
Silicates are the most common rock forming minerals.
Volcanic mountains are covered with sedimentary rocks.
Chemical sedimentary rocks are found in the beds of reservoirs.
Match the following.
| Group A | Group B | ||
| 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 |
