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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Question
Describe how igneous rocks are formed.
Short Answer
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Solution
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Rock and it's Types
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Chapter 6: Rocks - EXERCISES [Page 64]
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RELATED QUESTIONS
Rocks and minerals play a very important role in our lives.
Can you imagine modern life without minerals?
Classify the following rocks by selecting the correct option given below:
limestone
State two characteristics of Basic Igneous Rocks.
What is sills?
State the types of rocks for the formation of which the following process is involved.
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How are sedimentary rocks classified on the basis of their formation?
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Give some examples of metamorphic rocks formed from sedimentary and igneous rocks.
Fill in the blanks
______ rocks are formed by the deposition of shells and skeletons of organism.
Give one term for the following statement:
Sheet like body of igneous rock.
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- Central Maharashtra
- South Konkan
- Vidarbha
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Distinguish between Metamorphic rock and sedimentary rock.
Match the following:
| (a) | Igneous | (i) | Magma |
| (b) | Sedimentary | (ii) | Transformation |
| (c) | Metamorphic | (iii) | Gypsum |
| (d) | Molten material | (iv) | Basalt |
| (e) | Rock Cycle | (v) | Marble |
______ rocks are also called Primary rocks.
Out of 2,000 different types, only ______ are the basic minerals commonly found all over the earth.
The world Igneous is derived from the Latin word ______ meaning ______.
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 |
