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
Give an example of intrusive igneous rock.
Classify the following rocks by selecting the correct option given below:
Gneiss
Classify the following rocks by selecting the correct option given below:
coal
State two points of distinction between rocks and minerals.
Why are the igneous rocks also called the primary rocks?
What processes are involved in the formation of Igneous Rocks?
State the types of rocks for the formation of which the following process is involved.
Accumulation takes place over long periods of time in seas, lakes and streams.
How are sedimentary and igneous rocks formed?
Classify the following rock: Quartzite
Give one term for the following statement:
Formed by evaporation in saline lakes.
Give an example of a Plutonic rock.
Give reasons for the following
Extrusive rocks generally have small crystals.
Which of the following monuments are built-in igneous rock?
- The Taj Mahal
- Fort Raigad
- The Red Fort
- Ellora Sculpture
Choose the incorrect statement from the following.
Classify and explain the rocks.
______ refer to rock in Greek.
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.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
