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प्रश्न
State the chief characteristics of metamorphic rocks.
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उत्तर
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They are harder and more compact than their original form.
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Most of them are impermeable; they do not allow water to percolate through them.
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They do not have fossils because fossils in sedimentary rocks are destroyed during metamorphism.
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They are formed due to a change in texture and composition of pre-existing rocks.
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New minerals are formed during the process of metamorphism.
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संबंधित प्रश्न
Write True or False. Rewrite the false statement correctly :
Sedimentary rocks are formed by the cooling and solidification of molten rock called magma
Name the rocks which are most widespread on the earth.
State the types of rocks for the formation of which the following process is involved.
Solidification of magma on the surface of the earth.
Distinguish between rocks and minerals.
Give a detailed account of lithiflcation of sedimentary rocks.
Sedimentary rocks are also called stratified rocks. Why?
Classify the following rock: Shale
Classify the following rock: Gypsum
Give one word for the following.
Stratified rock formed organically but from vegetative matter-swamps and forests.
Give one word for the following.
Igneous rocks, which contain a low percentage of silica.
Fill in the blanks
______ is formed, when the angular and coarse grains of some durable minerals are cemented together.
Give one term for the following statement:
It has a definite chemical composition with its own chemical and physical properties.
Chemical sedimentary rocks are found in the beds of reservoirs.
Igneous Rocks are ______ rocks.
Explain the type of Igneous Rocks.
Match the following.
| Group A | Group B | ||
| 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 |
