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प्रश्न
Name different types of sedimentary rocks.
Name the three types of sedimentary rocks based on their formation.
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उत्तर
The three types of sedimentary rocks based on their formation are:
- Mechanically formed sedimentary rocks (clastic rocks) - formed by accumulation and compaction of sediments (e.g. sandstone, shale).
- Organically formed sedimentary rocks - formed from organic materials like remains of plants and animals (e.g. coal, limestone).
- Chemically formed sedimentary rocks - formed by precipitation of minerals from water (e.g. limestone, chert).
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संबंधित प्रश्न
Write True or False. Rewrite the false statement correctly :
Rocks are used in construction industries.
Give an example of intrusive igneous rock.
Classify the following rocks by selecting the correct option given below:
Gneiss
Classify the following rocks by selecting the correct option given below:
schist
With the help of your teacher, collect different types of rocks such as granite, sandstone, limestone, marble, slate, graphite, etc. and prepare a chart containing information about their colour, hardness, texture, and permeability.
Explain this term associated with rocks: Laccoliths and Batholiths
State the types of rocks for the formation of which the following process is involved.
Formation of large crystals, coarse texture and slow cooling and compaction.
Classify the following rock: Gypsum
Classify the following rock: Loess
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.
The best example of chemically-formed sedimentary rock, which has been formed by the evaporation of water from solution containing minerals.
Fill in the blanks
______ rock contain a low percentage of silica and a high percentage of basic oxides.
Fill in the blanks
______ rocks cover wide area in Peninsular India and Columbia, the Snake Plateau of the U.S.A.
An aggregate of minerals on the Earth’s Crust is called ______.
______ rocks are also known as stratified rocks.
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 |
