Advertisements
Advertisements
Question
How is sand that flows in a river formed? Collect some information about where the sand comes from.
Advertisements
Solution
- 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.
RELATED QUESTIONS
Write True or False. Rewrite the false statement correctly :
Sedimentary rocks are formed by the cooling and solidification of molten rock called magma
How are igneous rocks formed?
Which rocks are associated with ores of metals?
Give two examples of sedimentary rocks.
State the types of rocks for the formation of which the following process is involved.
Solidification of magma on the surface of the earth.
What is meant by a rock?
Differentiate between Rock and Mineral
Sedimentary rocks are also called stratified rocks. Why?
Classify the following rock: Loess
Give one word for the following.
The core of the earth occupied by rock in iron and nickel.
Fill in the blanks
______ rock contain a low percentage of silica and a high percentage of basic oxides.
Give one example of an area of: Igneous rocks
State the properties of metamorphic rocks.
Give reasons for the following
Rocks are of great economic significance.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
This is the storehouse of rocks.
What is thermal metamorphism?
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.
