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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
What is crust?
Classify the following rocks by selecting the correct option given below:
sandstone
State two points of distinction between rocks and minerals.
Name any three elements of the earth’s crust.
Name three types of rocks.
Which rocks are associated with ores of metals?
Which rocks are associated with fossil fuels?
State the types of rocks for the formation of which the following process is involved.
Accumulation takes place over long periods of time in seas, lakes and streams.
Give one word for the following.
The core of the earth occupied by rock in iron and nickel.
Give one word for the following.
Igneous rocks, which contain a high percentage of silica.
Fill in the blanks
______ is the best example of the wind deposited stratified rock.
Give one example of an area of: Igneous rocks
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.
Choose the incorrect statement from the following.
The word ‘Igneous’ is derived from the ______ word.
Parent Rock is converted to loose Rock by ______.
The oldest sedimentary rocks of the world have been identified in ______.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
