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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: ______________.
Fill in the blank
Sedimentary rocks are formed from _____________ accumulated over long periods.
Write True or False. Rewrite the false statement correctly :
Sedimentary rocks are formed by the cooling and solidification of molten rock called magma
Write True or False. Rewrite the false statement correctly :
Rocks are used in construction industries.
Name any three elements of the earth’s crust.
Name any two characteristics of Igneous Rocks.
Distinguish between the following:
Plutonic and Volcanic rocks.
Distinguish between the following:
Sills and Dykes.
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.
Classify the following rock: Shale
Fill in the blanks
Extrusive rocks are also known as ______ rocks.
Fill in the blanks
______ rocks cover wide area in Peninsular India and Columbia, the Snake Plateau of the U.S.A.
Give one term for the following statement:
It has a definite chemical composition with its own chemical and physical properties.
How is sand that flows in a river formed? Collect some information about where the sand comes from.
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Chemical sedimentary rocks are found in the beds of reservoirs.
Which Soils are formed by the weathering of metamorphic rocks?
Why are crystalline rocks called so?
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.
