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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
Granite is an example of intrusive ________ rocks.
Fill in the blank
Sedimentary rocks are formed from _____________ accumulated over long periods.
Classify the following rocks by selecting the correct option given below:
marble
Name any three elements of the earth’s crust.
Explain this term associated with rocks: Lithification of Rocks.
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.
What is meant by a rock?
Distinguish between Regional and Contact metamorphism.
Give some examples of metamorphic rocks formed from sedimentary and igneous rocks.
Give one word for the following.
A sedimentary rock, which is composed of microscopically fine, soft and smooth particles.
How are sedimentary rocks classified?
Give one term for the following statement:
Rounded or sub-rounded fragments, usually water-born cobbles, pebble and gravel, cemented together by a matrix of calcium carbonate, silica, etc.
Why are the Igneous Rocks called Primary Rocks?
Fossils are found in.
Explain about Petrology.
______ rocks are also known as stratified rocks.
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
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 |
