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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
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:
granite
Classify the following rocks by selecting the correct option given below:
marble
How do acidic igneous rocks differ from basic igneous rocks?
Why are the igneous rocks also called the primary rocks?
Which rocks are associated with ores of metals?
What are known as metamorphic rocks?
Describe how igneous rocks are formed.
How are sedimentary rocks formed?
What are the causes of metamorphism?
How are chemically-formed sedimentary rocks formed? Give examples.
Classify the following rock: Gypsum
Classify the following rock: Quartzite
Give one word for the following.
Rocks formed by the cooling and solidification of molten rock from beneath the earth crust.
Give one word for the following.
The upper part of lithosphere, which is rich in silica and aluminium.
Why are the Igneous Rocks called Primary Rocks?
Give reasons for the following
Man’s habitat is the biosphere and not the lithosphere in the true sense.
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.
