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प्रश्न
What is sills?
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उत्तर
Sills are horizontal intrusions of magma that have forced their way between layers of existing rock and solidified there. Unlike dykes, which cut vertically across rock layers, sills lie parallel to the bedding planes. When the magma cools and hardens in these horizontal cracks, it forms a flat, sheet-like body of igneous rock.
संबंधित प्रश्न
Fill in the blank
A category of rock which is formed by the alteration of the parent rock due to heat and pressure is called: ______________.
Classify the following rocks by selecting the correct option given below:
shale
Classify the following rocks by selecting the correct option given below:
limestone
Explain the structure of the earth’s interior?
Name three types of rocks.
Which rocks are associated with ores of metals?
Explain this term associated with rocks: Fossil fuels
How are igneous rocks classified on the basis of their chemical composition?
Explain the formation of sedimentary rocks on the basis of agents of formation.
Give one example of an area of: Metamorphic rocks,
Give one term for the following statement:
Type of metamorphism in which changes are caused due to high pressure.
Give reasons for the following
Rocks are of great economic significance.
Mention a few specimens of magnificent rock-cut architecture in India?
Distinguish between:
Internal Processes and External processes.
______ into slate caused by thermal metamorphism.
______ rocks are also called Primary rocks.
The oldest sedimentary rocks of the world have been identified in ______.
What is thermal metamorphism?
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
