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प्रश्न
Why are the igneous rocks also called the primary rocks?
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उत्तर
The igneous rocks were the first to be formed. They form the basis of formation of other types of rocks. Thus, they are called primary rocks.
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संबंधित प्रश्न
Rocks and minerals play a very important role in our lives.
What problems would you face in their absence?
Write True or False. Rewrite the false statement correctly :
Basalt is an example of an intrusive igneous rock.
Classify the following rocks by selecting the correct option given below:
basalt
With the help of your teacher, collect different types of rocks such as granite, sandstone, limestone, marble, slate, graphite, etc. and prepare a chart containing information about their colour, hardness, texture, and permeability.
Name the rocks which are most widespread on the earth.
Name the three stages of lithification of Sedimentary rocks.
Distinguish between the following:
Thermal and Dynamic Metamorphism.
Classify the following rock: Shale
Give one word for the following.
The core of the earth occupied by rock in iron and nickel.
Give one term for the following statement:
Igneous rocks of deep seated origin.
Give reasons for the following
Extrusive rocks generally have small crystals.
Give reasons for the following
Silicates are the most common rock forming minerals.
Which one of the following is the most widespread most and productive category of soil.
How are igneous rocks formed?
This is the storehouse of rocks.
Explain Dynamic Metamorphism.
Mention some uses of rocks.
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.
Match the following.
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
