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प्रश्न
How are sedimentary rocks classified on the basis of their formation?
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.
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संबंधित प्रश्न
Fill in the blank
A category of rock which is formed by the alteration of the parent rock due to heat and pressure is called: ______________.
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Sedimentary rocks such as limestone change into ___________.
Name any three elements of the earth’s crust.
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Sedimentary rocks are also called stratified rocks. Why?
Classify the following rock: Dolomite
Classify the following rock: Loess
Classify the following rock: Quartzite
Classify the following rock: Schist
Give one word for the following.
The core of the earth occupied by rock in iron and nickel.
Give one word for the following.
Igneous rocks, which contain a high percentage of silica.
Fill in the blanks
______ rock contain a low percentage of silica and a high percentage of basic oxides.
Rocks are classified into ______ types.
Oldest Sedimentary rocks of the world has been identified in Green land.
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.
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 |
