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प्रश्न
Why are the Igneous Rocks called Primary Rocks?
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उत्तर
It is believed that the earth was in a molten state in the beginning Igneous rocks were the first rocks to be formed due to cooling and solidification of molten matter. Hence these are called Primary Rocks.
संबंधित प्रश्न
Why is diamond clear and hard while graphite is soft?
Why is coal hard and chunky?
What are minerals?
Classify the following rocks by selecting the correct option given below:
coal
How are igneous rocks formed?
Briefly define Mechanical Metamorphism.
What processes are involved in the formation of Igneous Rocks?
Explain this term associated with rocks: Laccoliths and Batholiths
How are chemically-formed sedimentary rocks formed? Give examples.
Classify the following rock: Graphite
Give one word for the following.
Igneous rocks, which contain a high percentage of silica.
Fill in the blanks
______ is formed, when the angular and coarse grains of some durable minerals are cemented together.
Fill in the blanks
______ rocks cover wide area in Peninsular India and Columbia, the Snake Plateau of the U.S.A.
Give one example of an area of: Igneous rocks
Which types of rocks are predominantly found at the following locations?
- Central Maharashtra
- South Konkan
- Vidarbha
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. | Granite | 1. | Bed rock |
| B. | Soil layer | 2. | Plutonic rock |
| C. |
Barren island |
3. | Strip farming |
| D. | Soil conservation | 4. | Active Volcano |
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
