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प्रश्न
Explain the formation of sedimentary rocks on the basis of agents of formation.
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उत्तर
There are five main types of rocks on the basis of agents of formation:
- Riverine Rocks These are formed by the sediments deposited by running water or a river.
- Lacustrine Rocks These are formed by the deposition of silt, etc., on the bed of lakes.
- Glacial Rocks These are formed by the debris carried off and deposited by glaciers.
- Aeolian Rocks These are formed by the deposition of sand accumulation by the wind.
- Marine Rocks These are formed by the deposition of sediments at the ocean floor. These types are calcareous and carbonaceous sedimentary rocks.
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संबंधित प्रश्न
Rocks and minerals play a very important role in our lives.
Can you imagine modern life without minerals?
Give an example of intrusive igneous rock.
Classify the following rocks by selecting the correct option given below:
marble
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.
Give one difference between Extrusive igneous and Intrusive igneous rocks.
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.
How are igneous rocks classified on the basis of their chemical composition?
How are sedimentary rocks classified on the basis of their formation?
What is meant by the term ‘metamorphism’?
Classify the following rock: Peat
Classify the following rock: Limestone
Classify the following rock: Gneiss
Classify the following rock: Schist
Give one word for the following.
Stratified rock formed organically but from vegetative matter-swamps and forests.
Fill in the blanks
______ is the best example of the wind deposited stratified rock.
Which one of the following is the most widespread most and productive category of soil.
The word ‘Igneous’ is derived from the ______ word.
What is lava?
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.
