The Elixir of Life — Important Questions

Removal of natural vegetation

Raman identifies 'removal of the natural protective coat of vegetation' as one of the contributory causes of soil erosion. Vegetation acts as a natural protection for soil, holding it together with roots and reducing the impact of rainfall. When this protective cover is removed, soil becomes vulnerable to being washed away by water. The other options - planting trees, building terraces, and contour cultivation - are actually preventive measures against soil erosion, not causes.

They appear shallow because of silt-laden water

Raman explains that the rain-fed tanks in South India 'are, of course, shallow, but this is less evident since the water is silt-laden and throws the light back, and the bottom does not therefore show up.' The silt (fine particles of soil) in the water makes it opaque, preventing us from seeing the actual shallow depth. This silt-laden quality gives the tanks their characteristic appearance and color, making them seem deeper than they actually are.

Rain or snowfall

Raman clearly states that 'Apart from artesian water the ultimate source in all cases is rain or snowfall.' This means that except for deep underground water sources (artesian water), all other water sources ultimately depend on precipitation from the atmosphere. Rivers, lakes, and surface water all originate from rain or melted snow. Even underground springs are often recharged by rainwater that seeps through the ground over time.

Terracing of land

Among the measures suggested by Raman to prevent soil erosion, 'terracing of the land' is specifically mentioned. Terracing involves creating step-like levels on sloping land to slow down water flow and prevent soil from being washed away. Other measures he mentions include construction of bunds, contour cultivation, and planting appropriate vegetation. The goal is to check water flow at the earliest stage before it gains destructive momentum.