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प्रश्न
Give reasons for the following
Rocks are of great economic significance.
उत्तर
Rocks are of great economic significance Some of the main benefits of rocks are as follows :
- After disintergration, they turn into valuable soils.
- They are the store-houses of a large number of minerals.
- They are the source of precious metals like gold, silver, platinum etc.
- They are source of fuel-minerals.
- They provide different types of stones.
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संबंधित प्रश्न
Fill in the blank
Sedimentary rocks are formed from _____________ accumulated over long periods.
Write True or False. Rewrite the false statement correctly :
Basalt is an example of an intrusive igneous rock.
How are igneous rocks formed?
With the help of your teacher, collect different types of rocks such as granite, sandstone, limestone, marble, slate, graphite, etc. and prepare a chart containing information about their colour, hardness, texture, and permeability.
Why are the igneous rocks also called the primary rocks?
Which rocks are associated with ores of metals?
What are known as metamorphic rocks?
Explain this term associated with rocks: Lithification of Rocks.
Distinguish between the following: Lava and Magma
State the types of rocks for the formation of which the following process is involved.
Solidification of magma on the surface of the earth.
Give some examples of metamorphic rocks formed from sedimentary and igneous rocks.
Classify the following rock: Coal
Give reasons for the following
Man’s habitat is the biosphere and not the lithosphere in the true sense.
How is sand that flows in a river formed? Collect some information about where the sand comes from.
Classify and explain the 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 |
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.
Match the following.
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
