Advertisements
Advertisements
प्रश्न
Give a detailed account of lithiflcation of sedimentary rocks.
Advertisements
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
Fill in the blank
A category of rock which is formed by the alteration of the parent rock due to heat and pressure is called: ______________.
Write True or False. Rewrite the false statement correctly :
Sedimentary rocks are formed by the cooling and solidification of molten rock called magma
What is sills?
Mention any two characteristics of Sedimentary Rocks.
Name the rocks which are most widespread on the earth.
Explain this term associated with rocks: Metamorphism
Distinguish between the following:
Sills and Dykes.
What are the causes of metamorphism?
What are metamorphic rocks?
Classify the following rock: Coal
Classify the following rock: Basalt
Give one word for the following.
Igneous rocks, which contain a high percentage of silica.
Give one term for the following statement:
Fine grained metamorphic rock, generally produced by the low grade metamorphism of shale.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
Explain the type of Igneous Rocks.
Intrusive Igneous rocks are also called ______ rocks.
What is thermal metamorphism?
Explain the different types of sedimentary 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 |
