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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
A category of rock which is formed by the alteration of the parent rock due to heat and pressure is called: ______________.
Write True or False. Rewrite the false statement correctly :
Rocks are used in construction industries.
State two characteristics of the mantle.
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.
What is the main characteristics of Basic Igneous Rocks?
Mention any two chief characteristics of Sedimentary Rocks.
Name the rocks which are most widespread on the earth.
Explain this term associated with rocks: Laccoliths and Batholiths
State the types of rocks for the formation of which the following process is involved.
Solidification of magma on the surface of the earth.
Classify the following rock: Shale
Classify the following rock: Gneiss
Classify the following rock: Schist
Why are Sedimentary rocks called the Secondary rocks?
How are igneous rocks formed?
Lava comes out from a volcano.
What are the characteristics of Sedimentary rocks?
Mention some uses of 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.
