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प्रश्न
How are sedimentary rocks classified on the basis of their formation?
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उत्तर
There are three types of this type of rocks :
- Mechanically formed rocks : Denudation of rocks by agents of change results in layers of sedimentary rocks by mechanism.
- Chemically formed rocks : These are formed by evaporation of calcarious water and accumulated along lake and lagoon beds, e.g. gypsum and rock salt.
- Organically formed rocks : These are formed by deposition of dead plants and animals e.g. limestone rock (or Calcareous rock) lignite, bituminous and anthracite coal are carbonaceous rocks formed by compression of vegetation under the layers of sedimentary rocks. In the same way petroleum in between the sedimentary rocks is the result of zurasic age dinosaurs e.g. shale rock, containing oil.
संबंधित प्रश्न
Why is coal hard and chunky?
Fill in the blank
Sedimentary rocks are formed from _____________ accumulated over long periods.
Write True or False. Rewrite the false statement correctly :
Sedimentary rocks are formed by the cooling and solidification of molten rock called magma
Which rocks are associated with fossil fuels?
Distinguish between the following:
Plutonic and Volcanic rocks.
Distinguish between the following:
Thermal and Dynamic Metamorphism.
Classify the following rock: Quartzite
Classify the following rock: Marble
Give one word for the following.
The outer layer of the earth.
Give one word for the following.
The lower part of ocean floor, comprising mainly of silica.
Fill in the blanks
______ is the best example of the wind deposited stratified rock.
Fossils are found in.
What are fossils?
Why are crystalline rocks called so?
What are the characteristics of Sedimentary rocks?
What is thermal metamorphism?
Explain Dynamic Metamorphism.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
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 |
