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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
Classify the following rocks by selecting the correct option given below:
basalt
Why are the igneous rocks also called the primary rocks?
Give one difference between Extrusive igneous and Intrusive igneous rocks.
Name the types Sedimentary rocks based on agents of formation.
Explain this term associated with rocks: Fossil fuels
State the types of rocks for the formation of which the following process is involved.
Decomposition of organic matter at different stages and over different periods of time.
Explain the formation of sedimentary rocks on the basis of agents of formation.
Give a detailed account of lithiflcation of sedimentary rocks.
Classify the following rock: Graphite
Fill in the blanks
Extrusive rocks are also known as ______ rocks.
Give one term for the following statement:
Formed by evaporation in saline lakes.
Why are the Igneous Rocks called Primary Rocks?
Give an example of a Plutonic rock.
Igneous rocks are called primary rocks.
Explain about Petrology.
Explain the type of Igneous Rocks.
______ rocks are also called Primary rocks.
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 |
