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प्रश्न
How are igneous rocks formed?
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उत्तर
Igneous rocks are formed by the cooling and solidification of molten rock called magma, which lies beneath the earth’s crust. These rocks are crystalline and compact. They do not occur in layers or strata, nor do they contain fossils. The cooling and solidification may take place at some depth within the earth or at the surface. The molten magma that reaches the surface of the earth is called lava. Thus, there are two types of igneous rocks classified on the basis of their place of origin – intrusive rocks, which form at some depth in the earth’s crust and extrusive rocks which form at or near the surface of the earth.
संबंधित प्रश्न
Fill in the blank
Sedimentary rocks such as limestone change into ___________.
Classify the following rocks by selecting the correct option given below:
limestone
The photograph shows you a type of rock that is widely used in the construction industry.
- Name the type of rock.
- How is it formed?
What is Geology?
What processes are involved in the formation of Igneous Rocks?
What is meant by the term ‘metamorphism’?
Classify the following rock: Clay
Classify the following rock: Limestone
Classify the following rock: Slate
Classify the following rock: Schist
Give one word for the following.
A sedimentary rock, which is composed of microscopically fine, soft and smooth particles.
Why are Sedimentary rocks called the Secondary rocks?
Give one term for the following statement:
Formed when mud layers compacted under great pressure composing 80% of this rock.
Give one term for the following statement:
Igneous rocks of deep seated origin.
Give an example of a Plutonic rock.
Give reasons for the following
Rocks are of great economic significance.
Give reasons for the following
Man’s habitat is the biosphere and not the lithosphere in the true sense.
Find the difference between:
Igneous and sedimentary rocks
Fossils are found in.
Kola sample title is located in ______.
Mention the types of rocks based on formation?
The types of rocks based on formation are
What are fossils?
The two types of Intrusive Igneous rocks are ______.
______ into slate caused by thermal metamorphism.
Lava comes out from a volcano.
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 |
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
