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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 diamond clear and hard while graphite is soft?
Classify the following rocks by selecting the correct option given below:
coal
Classify the following rocks by selecting the correct option given below:
gypsum
Explain this term associated with rocks: Metamorphism
Distinguish between the following:
Acid Igneous Rocks and Basic Igneous Rocks.
Name the main types of rocks.
Classify the following rock: Granite
Classify the following rock: Slate
Give one word for the following.
Rocks formed by the cooling and solidification of molten rock from beneath the earth crust.
Fill in the blanks
______ rocks cover wide area in Peninsular India and Columbia, the Snake Plateau of the U.S.A.
Give one term for the following statement:
Formed when mud layers compacted under great pressure composing 80% of this rock.
Why are the Igneous Rocks called Primary Rocks?
Fossils are found in.
Chemical sedimentary rocks are found in the beds of reservoirs.
Igneous rocks are found in the regions of volcanoes.
Minerals exist in nature ¡n the form of ______ or ______.
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.
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 |
