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]
APPEARS IN
संबंधित प्रश्न
Fill in the blank
Granite is an example of intrusive ________ rocks.
Classify the following rocks by selecting the correct option given below:
gypsum
Classify the following rocks by selecting the correct option given below:
limestone
How are igneous rocks formed?
Name the types Sedimentary rocks based on agents of formation.
Explain this term associated with rocks: Metamorphism
Distinguish between rocks and minerals.
What is meant by a rock?
Classify the following rock: Peat
Classify the following rock: Rock salt
Give one term for the following statement:
It has a definite chemical composition with its own chemical and physical properties.
Give one term for the following statement:
Formed by evaporation in saline lakes.
Why fossils are preserved in Sedimentary and not in Igneous rocks?
Give reasons for the following
Extrusive rocks generally have small crystals.
Distinguish between Metamorphic rock and sedimentary rock.
Explain the type of Igneous Rocks.
______ rocks are also called Primary rocks.
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. | Granite | 1. | Bed rock |
| B. | Soil layer | 2. | Plutonic rock |
| C. |
Barren island |
3. | Strip farming |
| D. | Soil conservation | 4. | Active Volcano |
