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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
Fill in the blank
Sedimentary rocks are formed from _____________ accumulated over long periods.
Classify the following rocks by selecting the correct option given below:
limestone
Why are the igneous rocks also called the primary rocks?
Give one difference between Extrusive igneous and Intrusive igneous rocks.
What is sills?
Give two examples of metamorphic rocks.
What is meant by a rock?
In what type of rocks do you find fossils and why?
Sedimentary rocks are also called stratified rocks. Why?
Distinguish between Thermal metamorphism and Dynamic metamorphism.
Classify the following rock: Gypsum
Fill in the blanks
The interior layer is the core, which is made up mainly of iron and nickel, and is called ______.
Fill in the blanks
______ is formed, when the angular and coarse grains of some durable minerals are cemented together.
Give reasons for the following
Rocks are of great economic significance.
Igneous rocks are found in the regions of volcanoes.
The world Igneous is derived from the Latin word ______ meaning ______.
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.
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
