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प्रश्न
How is sand that flows in a river formed? Collect some information about where the sand comes from.
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उत्तर
- The force of flowing streams is so great that they may destroy rocks and soil.
- The powerful stream currents erode rocks on higher ground, which are then swept away into the sea.
- Additionally, silt is carried down from the mountain top where the streams begin.
- The majority of the sand in the river is silt that the streams carry, together with weather material from inland rocks.
- Sand formation in a river is caused by erosion, which is the movement of rock and soil with the stream.
संबंधित प्रश्न
What is the difference between the inner and the outer core?
Give an example of intrusive igneous rock.
The photograph shows you a type of rock that is widely used in the construction industry.
- Name the type of rock.
- How is it formed?
Distinguish between the following pair:
Degradation and aggradation
Which rocks are associated with ores of metals?
Explain this term associated with rocks: Laccoliths and Batholiths
What is metamorphism?
Give one word for the following.
The core of the earth occupied by rock in iron and nickel.
Give one word for the following.
Igneous rocks, which contain a high percentage of silica.
Give one word for the following.
A sedimentary rock, which is composed of microscopically fine, soft and smooth particles.
Fill in the blanks
______ is the best example of the wind deposited stratified rock.
Give one term for the following statement:
Fine grained metamorphic rock, generally produced by the low grade metamorphism of shale.
Why are the Igneous Rocks called Primary Rocks?
Rocks are classified into ______ types.
The oldest sedimentary rocks of the world have been identified in ______.
______ refer to rock in Greek.
Minerals exist in nature ¡n the form of ______ or ______.
Sedimentary rocks are called stratified rocks.
Match the following.
| A. | Granite | 1. | Bed rock |
| B. | Soil layer | 2. | Plutonic rock |
| C. |
Barren island |
3. | Strip farming |
| D. | Soil conservation | 4. | Active Volcano |
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
