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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
Write True or False. Rewrite the false statement correctly :
Rocks are used in construction industries.
State two points of distinction between rocks and minerals.
Name the types Sedimentary rocks based on agents of formation.
Distinguish between the following:
Acid Igneous Rocks and Basic Igneous Rocks.
Sedimentary rocks are also called stratified rocks. Why?
Classify the following rock: Coal
Classify the following rock: Clay
Classify the following rock: Limestone
Give one word for the following.
Igneous rocks, which contain a high percentage of silica.
Give reasons for the following
Extrusive rocks generally have small crystals.
______ is known as the primary rocks.
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Kola sample title is located in ______.
What are the uses of soil?
______ refer to rock in Greek.
Minerals exist in nature ¡n the form of ______ or ______.
Intrusive Igneous rocks are also called ______ rocks.
Mention some uses of rocks.
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 |
