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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
Classify the following rocks by selecting the correct option given below:
shale
How are rocks different from minerals?
Name two important landforms made by Igneous Rocks.
Name the types Sedimentary rocks based on agents of formation.
Explain this term associated with rocks: Laccoliths and Batholiths
Distinguish between the following:
Calcarious and Carbonacious rocks.
Explain the formation of sedimentary rocks on the basis of agents of formation.
Classify the following rock: Coal
Give one word for the following.
The upper part of lithosphere, which is rich in silica and aluminium.
Give one word for the following.
A sedimentary rock, which is composed of microscopically fine, soft and smooth particles.
Give one term for the following statement:
Type of metamorphism in which changes are caused due to high pressure.
Give reasons for the following
Rocks are of great economic significance.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
An aggregate of minerals on the Earth’s Crust is called ______.
______ into slate caused by thermal metamorphism.
Oldest Sedimentary rocks of the world has been identified in Green land.
Intrusive Igneous rocks are also called ______ rocks.
Explain the different types of sedimentary rocks.
Match the following.
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
