Igneous rocks are formed by the cooling, solidification, and crystallisation of molten magma either beneath the surface or on the surface of the Earth. When magma cools slowly beneath the surface, it forms intrusive igneous rocks with large crystals. When it erupts and cools quickly on the surface as lava, it forms extrusive igneous rocks with fine grains.
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प्रश्न
Describe how igneous rocks are formed.
लघु उत्तर
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उत्तर
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Rock and it's Types
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पाठ 6: Rocks - EXERCISES [पृष्ठ ६४]
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संबंधित प्रश्न
Classify the following rocks by selecting the correct option given below:
limestone
What is Geology?
Give one difference between Extrusive igneous and Intrusive igneous rocks.
Classify the igneous rocks on the basis of their place of origin.
State the chief characteristics of metamorphic rocks.
What is meant by a rock?
Distinguish between Thermal metamorphism and Dynamic metamorphism.
Distinguish between Regional and Contact metamorphism.
Give some examples of metamorphic rocks formed from sedimentary and igneous rocks.
Classify the following rock: Rock salt
Give one word for the following.
Igneous rocks, which contain a high percentage of silica.
Find the difference between:
Igneous and sedimentary rocks
Fossils are found in.
How are igneous rocks formed?
Igneous Rocks are ______ rocks.
Explain about Petrology.
| A | B | ||
| 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 |
