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प्रश्न
What are the causes of metamorphism?
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उत्तर
The main causes are great temperature and pressure beneath the earth’s crust, which change the original texture and form of the rocks into dense, crystalline, and fine-grained rocks.
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संबंधित प्रश्न
Fill in the blank
Sedimentary rocks such as limestone change into ___________.
What is crust?
Differentiate between SIAL and SIMA.
Classify the following rocks by selecting the correct option given below:
sandstone
Explain this term associated with rocks: Lithification of Rocks.
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.
How are sedimentary rocks formed?
Give a detailed account of lithiflcation of sedimentary rocks.
Classify the following rock: Schist
Fill in the blanks
______ rock contain a low percentage of silica and a high percentage of basic oxides.
Give one term for the following statement:
Rounded or sub-rounded fragments, usually water-born cobbles, pebble and gravel, cemented together by a matrix of calcium carbonate, silica, etc.
Give reasons for the following
Extrusive rocks generally have small crystals.
Match the following:
| (a) | Igneous | (i) | Magma |
| (b) | Sedimentary | (ii) | Transformation |
| (c) | Metamorphic | (iii) | Gypsum |
| (d) | Molten material | (iv) | Basalt |
| (e) | Rock Cycle | (v) | Marble |
The word ‘Igneous’ is derived from the ______ word.
The two types of Intrusive Igneous rocks are ______.
Oldest Sedimentary rocks of the world has been identified in Green land.
Match the following:
| Group 'A' | Group 'B' | ||
| A. | Granite | 1. | Bedrock |
| B. | Soil layer | 2. | Plutonic rock |
| C. | Barren island | 3. | Strip farming |
| D. | Soil conservation | 4. | Active Volcano |
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 |
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
