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प्रश्न
How are igneous rocks formed?
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उत्तर
Igneous rocks are formed by the cooling and solidification of molten rock called magma, which lies beneath the earth’s crust. These rocks are crystalline and compact. They do not occur in layers or strata, nor do they contain fossils. The cooling and solidification may take place at some depth within the earth or at the surface. The molten magma that reaches the surface of the earth is called lava. Thus, there are two types of igneous rocks classified on the basis of their place of origin – intrusive rocks, which form at some depth in the earth’s crust and extrusive rocks which form at or near the surface of the earth.
संबंधित प्रश्न
Discuss the importance of rocks for the construction business.
Differentiate between SIAL and SIMA.
What are minerals?
Give an example of intrusive igneous rock.
Classify the following rocks by selecting the correct option given below:
coal
Name any three elements of the earth’s crust.
Give one difference between Extrusive igneous and Intrusive igneous rocks.
Name two important landforms made by Igneous Rocks.
Name the types Sedimentary rocks based on agents of formation.
What processes are involved in the formation of Igneous Rocks?
Explain this term associated with rocks: Metamorphism
State the types of rocks for the formation of which the following process is involved.
Formation of large crystals, coarse texture and slow cooling and compaction.
How are igneous rocks classified on the basis of their chemical composition?
Name the main types of rocks.
Differentiate between Rock and Mineral
What physical agents are involved in the sedimentary rocks?
Classify the following rock: Coal
Classify the following rock: Slate
How are sedimentary rocks classified?
Igneous rocks are called primary rocks.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
Parent Rock is converted to loose Rock by ______.
______ rocks are also called Primary rocks.
The oldest sedimentary rocks of the world have been identified in ______.
Minerals exist in nature ¡n the form of ______ or ______.
What is lava?
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.
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 |
