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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
Classify the following rocks by selecting the correct option given below:
gneiss
Classify the following rocks by selecting the correct option given below:
coal
Classify the following rocks by selecting the correct option given below:
basalt
Distinguish between the following pair:
Degradation and aggradation
Why are the igneous rocks also called the primary rocks?
What is metamorphism?
How are sedimentary and igneous rocks formed?
Classify the following rock: Shale
Classify the following rock: Slate
Give one word for the following.
The upper part of lithosphere, which is rich in silica and aluminium.
Give reasons for the following
Man’s habitat is the biosphere and not the lithosphere in the true sense.
Fill in the blank below:
______are intrusions of igneous rock that are vertical in shape
How is sand that flows in a river formed? Collect some information about where the sand comes from.
Classify and explain the rocks.
Mention the types of rocks based on formation?
The types of rocks based on formation are
An aggregate of minerals on the Earth’s Crust is called ______.
What is Thermal Metamorphism?
Match the following.
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
