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प्रश्न
Describe how are igneous rocks formed? State their chief characteristics.
उत्तर
Igneous rocks are formed by melting and cooling of magma originated from volcanic eruptions. These may be formed by diastrophism and volcanism. These rocks are strong, crystalline and dark in colour. These may be extrusive and intrusive on the surface and beneath the crust respectively.
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संबंधित प्रश्न
Fill in the blank
Granite is an example of intrusive ________ rocks.
Write True or False. Rewrite the false statement correctly :
Minerals are organic substances.
Classify the following rocks by selecting the correct option given below:
gypsum
Classify the following rocks by selecting the correct option given below:
marble
Distinguish between the following pair:
Degradation and aggradation
How are sedimentary rocks formed?
How are rocks important to us?
What is meant by the term ‘metamorphism’?
Classify the following rock: Rock salt
Classify the following rock: Quartzite
How are sedimentary rocks classified?
Which of the following monuments are built-in igneous rock?
- The Taj Mahal
- Fort Raigad
- The Red Fort
- Ellora Sculpture
Parent Rock is converted to loose Rock by ______.
Intrusive Igneous rocks are also called ______ rocks.
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:
| Group 'A' | Group 'B' | ||
| A. | Granite | 1. | Bedrock |
| B. | Soil layer | 2. | Plutonic rock |
| C. | Barren island | 3. | Strip farming |
| D. | Soil conservation | 4. | Active Volcano |
Match the following.
| Group A | Group 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.
