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प्रश्न
Explain the following terms.
Colloids
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उत्तर
Colloids: Colloids are extremely tiny particles which are so small that they can not be seen by optical microscope ‘ and remain suspended indefinitely in water. They have the property of being electrically charged and can attract and hold ions of calcium, magnesium and potassium, known as bases. These bases are required by plants for their growth. – Soil colloids are also useful in holding water in the soil. When present in large quantities, they make the soil sticky and tough so that it is difficult to cultivate.
संबंधित प्रश्न
Give geographical reason:
Temperature changes result in physical weathering.
Give geographical reason:
Gases in the atmosphere affect weathering.
Give a technical term for the following:
Peeling off of the outer layer of rock through contraction and expansion.
Define weathering.
What is weathering? Illustrate the process graphically.
Distinguish between the following:
Sheet erosion and gully erosion.
How are the different kinds of soils in Temperate zones formed?
Give reasons for the following :
Climate is the most important factor of soil formation.
Give reasons for the following :
Grassland soils are less acidic than forest soils.
Is weathering essential as a pre-requisite in the formation of soils? Why?
