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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
Rocks and minerals play a very important role in our lives.
What problems would you face in their absence?
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 :
Igneous and sedimentary rocks can change into metamorphic rocks.
Classify the following rocks by selecting the correct option given below:
sandstone
Give two examples of sedimentary rocks.
Classify the following rock: Gypsum
Classify the following rock: Granite
Fill in the blanks
______ rocks cover wide area in Peninsular India and Columbia, the Snake Plateau of the U.S.A.
Why are Sedimentary rocks called the Secondary rocks?
Give reasons for the following
Extrusive rocks generally have small crystals.
Chemical sedimentary rocks are found in the beds of reservoirs.
Distinguish between Metamorphic rock and sedimentary rock.
How are igneous rocks formed?
Distinguish between:
Internal Processes and External processes.
Igneous Rocks are ______ rocks.
The word Ignis means rock.
Explain about Petrology.
What is lava?
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 |
