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 उत्तरीय
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उत्तर
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Rock and it's Types
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अध्याय 6: Rocks - EXERCISES [पृष्ठ ६४]
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संबंधित प्रश्न
Why is coal hard and chunky?
Fill in the blank
A category of rock which is formed by the alteration of the parent rock due to heat and pressure is called: ______________.
What are minerals?
Describe the process that leads to exfoliation.
State two points of distinction between rocks and minerals.
What is sills?
Explain this term associated with rocks: Fossil fuels
Classify the following rock: Shale
Classify the following rock: Peat
Give one word for the following.
The lower part of ocean floor, comprising mainly of silica.
Fill in the blanks
______ rock contain a low percentage of silica and a high percentage of basic oxides.
Give one example of an area of: Sedimentary rocks in India
Distinguish between Metamorphic rock and sedimentary rock.
Mention a few specimens of magnificent rock-cut architecture in India?
How are igneous rocks formed?
What are fossils?
Distinguish between:
Internal Processes and External processes.
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.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
