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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
Classify the following rocks by selecting the correct option given below:
coal
Distinguish between the following pair:
Degradation and aggradation
Name the three stages of lithification of Sedimentary rocks.
Describe how igneous rocks are formed.
Explain the formation of sedimentary rocks on the basis of agents of formation.
What is metamorphism?
Name different types of sedimentary rocks.
Classify the following rock: Coal
Classify the following rock: Clay
Classify the following rock: Rock salt
Classify the following rock: Graphite
Give one word for the following.
The lower part of ocean floor, comprising mainly of silica.
Give reasons for the following
Silicates are the most common rock forming minerals.
Igneous rocks are called primary rocks.
Diamond is an example of _______ rock.
How are igneous rocks formed?
This is the storehouse 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
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 |
