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प्रश्न
Give a detailed account of lithiflcation of sedimentary rocks.
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उत्तर
Lithification means solidification. The loose material carried on by water, wind and ice is deposited slowly in different layers one upon another. Gradually the deposited sediments become solid and hard due to pressure and temperature. Evaporation results in the loss of water within the sediments and these are compacted and cemented. Compaction takes place by increasing weight and pressure of over lying sediments e.g. sand is converted to sandstone. Cementation takes place by bonding of compacted sediments by natural elements like calcium compounds, silica and iron with a property to bind the loose materials to solid state.
संबंधित प्रश्न
Differentiate between SIAL and SIMA.
Classify the following rocks by selecting the correct option given below:
gypsum
How are sedimentary rocks formed?
State two points of distinction between rocks and minerals.
Name three types of rocks.
What is meant by a rock?
What are metamorphic rocks?
Classify the following rock: Coal
Classify the following rock: Gypsum
How are sedimentary rocks classified?
Give one term for the following statement:
Formed when mud layers compacted under great pressure composing 80% of this rock.
Give one term for the following statement:
Sheet like body of igneous rock.
Give one term for the following statement:
Rounded or sub-rounded fragments, usually water-born cobbles, pebble and gravel, cemented together by a matrix of calcium carbonate, silica, etc.
Why are the Igneous Rocks called Primary Rocks?
Give reasons for the following
Man’s habitat is the biosphere and not the lithosphere in the true sense.
An aggregate of minerals on the Earth’s Crust is called ______.
Out of 2,000 different types, only ______ are the basic minerals commonly found all over the earth.
What is lava?
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 |
