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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
Write True or False. Rewrite the false statement correctly :
Rocks are used in construction industries.
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gypsum
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marble
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Plutonic and Volcanic rocks.
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Sills and Dykes.
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What is meant by a rock?
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Distinguish between Regional and Contact metamorphism.
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A sedimentary rock, which is composed of microscopically fine, soft and smooth particles.
Fill in the blanks
The interior layer is the core, which is made up mainly of iron and nickel, and is called ______.
What is the basis for the classification of rocks?
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Formed by evaporation in saline lakes.
Fill in the blank below:
______are intrusions of igneous rock that are vertical in shape
Fossils are found in.
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
The word ‘Igneous’ is derived from the ______ word.
Explain the type of Igneous Rocks.
The world Igneous is derived from the Latin word ______ meaning ______.
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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.
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
