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प्रश्न
Name the three stages of lithification of Sedimentary rocks.
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उत्तर
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Compaction: The weight of overlying layers compresses the sediments, reducing pore spaces.
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Evaporation: Water is removed, leaving behind dissolved minerals.
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Cementation: Minerals like silica, calcium compounds, or iron bind the compacted sediments together, turning them into solid rock.
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संबंधित प्रश्न
Why is diamond clear and hard while graphite is soft?
What are minerals?
State two points of distinction between rocks and minerals.
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Explain this term associated with rocks: Lithification of Rocks.
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Rounded or sub-rounded fragments, usually water-born cobbles, pebble and gravel, cemented together by a matrix of calcium carbonate, silica, etc.
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Igneous rocks are called primary rocks.
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Choose the incorrect statement from the following.
Igneous rocks are found in the regions of volcanoes.
What are metamorphic rocks?
Lava comes out from a volcano.
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 |
