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प्रश्न
Give a detailed account of lithiflcation of sedimentary rocks.
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.
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संबंधित प्रश्न
Write True or False. Rewrite the false statement correctly :
Igneous and sedimentary rocks can change into metamorphic rocks.
How are igneous rocks formed?
Name the rocks which are most widespread on the earth.
What are known as metamorphic rocks?
Distinguish between the following: Plutonic and Volcanic rocks.
How are igneous rocks classified on the basis of their chemical composition?
How are chemically-formed sedimentary rocks formed? Give examples.
Distinguish between Regional and Contact metamorphism.
Classify the following rock: Coal
Classify the following rock: Graphite
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
______ rocks cover wide area in Peninsular India and Columbia, the Snake Plateau of the U.S.A.
Fossils are found in.
Which one of the following is the most widespread most and productive category of soil.
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Mention the types of rocks based on formation?
The types of rocks based on formation are
Igneous Rocks are ______ rocks.
______ rocks are also 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 |
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
