Question

Give geographical reasons for the following:

The colour of alluvium varies in different areas.

Answer 1

Alluvium soil colour varies based on deposition depth, texture, and maturation time.

Answer 2

The colour of alluvium varies in different areas because it depends on factors such as the depth of deposition, the texture of the materials, and the time taken for the soil to mature. For example, in upper reaches of rivers, the soil is often dry, coarse, porous, and sandy, while further down the river valley, the soil particles become smaller, more uniform, compact, less coarse, and more moist, affecting the colour from light grey to deep black. Additionally, the presence of different minerals and organic content influences the colour variation in alluvium.