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प्रश्न
How is sand that flows in a river formed? Collect some information about where the sand comes from.
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
Classify the following rocks by selecting the correct option given below:
sandstone
What are metamorphic rocks?
What is the main characteristics of Basic Igneous Rocks?
Which rocks are associated with fossil fuels?
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.
State the types of rocks for the formation of which the following process is involved.
Decomposition of organic matter at different stages and over different periods of time.
What is meant by a rock?
What are metamorphic rocks?
Give one word for the following.
The outer layer of the earth.
Give one word for the following.
Igneous rocks, which contain a high percentage of silica.
Fill in the blanks
______ rock contain a low percentage of silica and a high percentage of basic oxides.
How are sedimentary rocks classified?
State the properties of metamorphic rocks.
______ is the kind of metamorphic rock using which Taj Mahal was built.
Igneous rocks are found in the regions of volcanoes.
Why are crystalline rocks called so?
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 |
Match the following.
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
