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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
Rocks and minerals play a very important role in our lives.
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Classify the following rocks by selecting the correct option given below:
granite
What are known as metamorphic rocks?
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Calcarious and Carbonacious rocks.
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How are chemically-formed sedimentary rocks produced?
Classify the following rock: Clay
Give one term for the following statement:
It has a definite chemical composition with its own chemical and physical properties.
How is Plutonic rock formed?
Give reasons for the following
Silicates are the most common rock forming minerals.
How is sand that flows in a river formed? Collect some information about where the sand comes from.
Fossils are found in.
Match the following:
| (a) | Igneous | (i) | Magma |
| (b) | Sedimentary | (ii) | Transformation |
| (c) | Metamorphic | (iii) | Gypsum |
| (d) | Molten material | (iv) | Basalt |
| (e) | Rock Cycle | (v) | Marble |
Igneous Rocks are ______ rocks.
The word Ignis means rock.
______ rocks are also known as stratified rocks.
______ are chemical substances which exist in nature.
Match the following.
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
