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प्रश्न
How are igneous rocks classified on the basis of their chemical composition?
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उत्तर
On the basis of chemical composition igneous rocks may be classified into two groups i.e. Acid igneous rocks and Basic igneous rocks. Acid rocks have silica content 65-85 percent e.g. granite which is made up of large crystals of quartz, feldspar and mica. Basic rocks contain high percentage oxides of denser material, silica content is between 40-60 percent with a density of 2.8 g/cm3 and 3.0 g/cm3. Acid rocks are lighter than Basic rocks.
संबंधित प्रश्न
Fill in the blank
Conglomerate is an example of _____________ rocks.
Classify the following rocks by selecting the correct option given below:
granite
How are igneous rocks formed?
What are metamorphic rocks?
Distinguish between the following pair:
Degradation and aggradation
Explain this term associated with rocks: Metamorphism
What are the causes of metamorphism?
State the chief characteristics of metamorphic rocks.
How are rocks important to us?
Classify the following rock: Coal
Classify the following rock: Gypsum
Give one word for the following.
The outer layer of the earth.
State the properties of metamorphic rocks.
Give one term for the following statement:
It has a definite chemical composition with its own chemical and physical properties.
Why fossils are preserved in Sedimentary and not in Igneous rocks?
Give reasons for the following
Rocks are of great economic significance.
Fill in the blank below:
______are intrusions of igneous rock that are vertical in shape
Minerals exist in nature ¡n the form of ______ or ______.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
