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प्रश्न
Give reasons for the following
Extrusive rocks generally have small crystals.
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उत्तर
Extrusive rocks generally have small crystals because in the formation of these rocks, the solidification of magma takes place at a slower rate.
संबंधित प्रश्न
Explain this term associated with rocks: Lithification of Rocks.
State the types of rocks for the formation of which the following process is involved.
Solidification of magma on the surface of the earth.
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.
Distinguish between rocks and minerals.
What is metamorphism?
Sedimentary rocks are also called stratified rocks. Why?
Give one word for the following.
Igneous rocks, which contain a high percentage of silica.
Give one word for the following.
A sedimentary rock, which is composed of microscopically fine, soft and smooth particles.
Give one term for the following statement:
Formed when mud layers compacted under great pressure composing 80% of this rock.
Why fossils are preserved in Sedimentary and not in Igneous rocks?
Give an example of a Plutonic rock.
Give reasons for the following
Rocks are of great economic significance.
The two types of Intrusive Igneous rocks are ______.
What are the characteristics of Sedimentary rocks?
Explain Dynamic Metamorphism.
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 |
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 |
